Name: Hydrogen Symbol: H Atomic number: 1 Atomic weight: 1.008 State: gas Group, period, block: 1, 1, s Color: Colorless Classification: Non-metallic Electron Configuration: 1s¹

Name: Helium Symbol: He Atomic number: 2 Atomic weight: 4.0026 State: gas Group, period, block: 18, 1, s Color: Colorless Classification: noble gases Electron Configuration: 1s²

Name: Lithium Symbol: Li Atomic number: 3 Atomic weight: 6.94 State: solid Group, period, block: 1, 2, s Color: silvery white Classification: alkali metal Electron Configuration: [He] 2s¹

Name: Beryllium Symbol: Be Atomic number: 4 Atomic weight: 9.0122 State: solid Group, period, block: 2, 2, s Color: white-gray metallic Classification: alkaline earth metal Electron Configuration: [He] 2s²

Name: Boron Symbol: B Atomic number: 5 Atomic weight: 10.81 State: solid Group, period, block: 13, 2, p Color: black-brown Classification: metalloid Electron Configuration: [He] 2s² 2p¹

Name: Carbon Symbol: C Atomic number: 6 Atomic weight: 12.011 State: solid Group, period, block: 14, 2, p Color: clear (diamond) & black (graphite) Classification: Non-metallic Electron Configuration: [He] 2s² 2p²

Name: Nitrogen Symbol: N Atomic number: 7 Atomic weight: 14.007 State: gas Group, period, block: 15, 2, p Color: colorless gas, liquid or solid Classification: Non-metallic Electron Configuration: [He] 2s² 2p³

Name: Oxygen Symbol: O Atomic number: 8 Atomic weight: 15.999 State: gas Group, period, block: 16, 2, p Color: colorless gas, pale blue liquid Classification: Non-metallic Electron Configuration: [He] 2s² 2p⁴

Name: Fluorine Symbol: F Atomic number: 9 Atomic weight: 18.998 State: gas Group, period, block: 17, 2, p Color: gas:pale yellow, liquid:bright yellow Classification: halogen Electron Configuration: [He] 2s² 2p⁵

Name: Neon Symbol: Ne Atomic number: 10 Atomic weight: 20.180 State: gas Group, period, block: 18, 2, p Color: colorless gas Classification: noble gases Electron Configuration: [He] 2s² 2p⁶

Name: Sodium Symbol: Na Atomic number: 11 Atomic weight: 22.990 State: solid Group, period, block: 1, 3, s Color: silvery white metallic Classification: alkali metal Electron Configuration: [Ne] 3s¹

Name: Magnesium Symbol: Mg Atomic number: 12 Atomic weight: 24.305 State: solid Group, period, block: 2, 3, s Color: shiny grey solid Classification: alkaline earth metal Electron Configuration: [Ne] 3s²

Name: Aluminium Symbol: Al Atomic number: 13 Atomic weight: 26.982 State: solid Group, period, block: 13, 3, p Color: silvery gray metallic Classification: Post-transition metal Electron Configuration: [Ne] 3s² 3p¹

Name: Silicon Symbol: Si Atomic number: 14 Atomic weight: 28.085 State: solid Group, period, block: 14, 3, p Color: crystalline with bluish-tinged faces Classification: metalloid Electron Configuration: [Ne] 3s² 3p²

Name: Phosphorus Symbol: P Atomic number: 15 Atomic weight: 30.974 State: solid Group, period, block: 15, 3, p Color: colourless, waxy white Classification: Non-metallic Electron Configuration: [Ne] 3s² 3p³

Name: Sulfur Symbol: S Atomic number: 16 Atomic weight: 32.06 State: solid Group, period, block: 16, 3, p Color: lemon yellow sintered microcrystals Classification: Non-metallic Electron Configuration: [Ne] 3s² 3p⁴

Name: Chlorine Symbol: Cl Atomic number: 17 Atomic weight: 35.45 State: gas Group, period, block: 17, 3, p Color: pale yellow-green gas Classification: halogen Electron Configuration: [Ne] 3s² 3p⁵

Name: Argon Symbol: Ar Atomic number: 18 Atomic weight: 39.948 State: gas Group, period, block: 18, 3, p Color: colorless Classification: noble gases Electron Configuration: [Ne] 3s² 3p⁶

Name: Potassium Symbol: P Atomic number: 19 Atomic weight: 39.098 State: solid Group, period, block: 1, 4, s Color: silvery gray Classification: alkali metal Electron Configuration: [Ar] 4s¹

Name: Calcium Symbol: C Atomic number: 20 Atomic weight: 40.078 State: solid Group, period, block: 2, 4, s Color: dull gray, silver Classification: alkaline earth metal Electron Configuration: [Ar] 4s²

Name: Scandium Symbol: Sc Atomic number: 21 Atomic weight: 44.956 State: solid Group, period, block: 3, 4, d Color: silvery white Classification: transition metal Electron Configuration: [Ar] 3d¹ 4s²

Name: Titanium Symbol: Ti Atomic number: 22 Atomic weight: 47.867 State: solid Group, period, block: 4, 4, d Color: silvery grey-white metallic Classification: transition metal Electron Configuration: [Ar] 3d² 4s²

Name: Vanadium Symbol: V Atomic number: 23 Atomic weight: 50.942 State: solid Group, period, block: 5, 4, d Color: blue-silver-grey metal Classification: transition metal Electron Configuration: [Ar] 3d³ 4s²

Name: Chromium Symbol: C Atomic number: 24 Atomic weight: 51.996 State: solid Group, period, block: 6, 4, d Color: silvery metallic Classification: transition metal Electron Configuration: [Ar] 3d⁵ 4s¹

Name: Manganese Symbol: Mn Atomic number: 25 Atomic weight: 54.938 State: solid Group, period, block: 7, 4, d Color: silvery metallic Classification: transition metal Electron Configuration: [Ar] 3d⁵ 4s²

Name: Iron Symbol: Fe Atomic number: 26 Atomic weight: 55.845 State: solid Group, period, block: 8, 4, d Color: lustrous metallic with a grayish tinge Classification: transition metal Electron Configuration: [Ar] 3d⁶ 4s¹

Name: Cobalt Symbol: Co Atomic number: 27 Atomic weight: 58.933 State: solid Group, period, block: 9, 4, d Color: hard lustrous gray metal Classification: transition metal Electron Configuration: [Ar] 3d⁷ 4s²

Name: Nickel Symbol: Ni Atomic number: 28 Atomic weight: 58.693 State: solid Group, period, block: 10, 4, d Color: lustrous, metallic, and silver with a gold tinge Classification: transition metal Electron Configuration: [Ar] 3d⁸ 4s²

Name: Copper Symbol: Cu Atomic number: 29 Atomic weight: 63.546 State: solid Group, period, block: 11, 4, d Color: red-orange metallic luster Classification: transition metal Electron Configuration: [Ar] 3d¹⁰ 4s¹

Name: Zinc Symbol: Zn Atomic number: 30 Atomic weight: 65.38 State: solid Group, period, block: 12, 4, d Color: silver-gray Classification: transition metal Electron Configuration: [Ar] 3d¹⁰ 4s²

Name: Gallium Symbol: Ga Atomic number: 31 Atomic weight: 69.723 State: solid Group, period, block: 13, 4, p Color: silver-white Classification: post-transition metal Electron Configuration: [Ar] 3d⁷ 4s² 4p¹

Name: Germanium Symbol: Ge Atomic number: 32 Atomic weight: 72.63 State: solid Group, period, block: 14, 4, p Color: grayish-white Classification: metalloid Electron Configuration: [Ar] 3d¹⁰ 4s² 4p²

Name: Arsenic Symbol: As Atomic number: 33 Atomic weight: 74.922 State: solid Group, period, block: 15, 4, p Color: metallic grey Classification: metalloid Electron Configuration: [Ar] 3d¹⁰ 4s² 4p³

Name: Selenium Symbol: Se Atomic number: 34 Atomic weight: 78.96 State: solid Group, period, block: 16, 4, p Color: black and red allotropes Classification: Non-metallic Electron Configuration: [Ar] 3d¹⁰ 4s² 4p⁴

Name: Bromine Symbol: Br Atomic number: 35 Atomic weight: 79.904 State: liquid Group, period, block: 17, 4, p Color: red-brown (g/l), metallic luster (s) Classification: halogen Electron Configuration: [Ar] 3d¹⁰ 4s² 4p⁵

Name: Krypton Symbol: Kr Atomic number: 36 Atomic weight: 83.798 State: gas Group, period, block: 18, 4, p Color: colorless gas Classification: noble gases Electron Configuration: [Ar] 3d¹⁰ 4s² 4p⁶

Name: Rubidium Symbol: Rb Atomic number: 37 Atomic weight: 85.468 State: solid Group, period, block: 1, 5, s Color: grey white Classification: alkali metal Electron Configuration: [Kr] 5s¹

Name: Strontium Symbol: Sr Atomic number: 38 Atomic weight: 87.62 State: solid Group, period, block: 2, 5, s Color: silvery white metallic Classification: alkaline earth metal Electron Configuration: [Kr] 5s²

Name: Yttrium Symbol: Y Atomic number: 39 Atomic weight: 88.906 State: solid Group, period, block: 3, 5, d Color: Csilvery white Classification: transition metal Electron Configuration: [Kr] 4d¹ 5s²

Name: Zirconium Symbol: Zr Atomic number: 40 Atomic weight: 91.224 State: solid Group, period, block: 4, 5, d Color: silvery white Classification: transition metal Electron Configuration: [Kr] 4d² 5s²

Name: Niobium Symbol: Nb Atomic number: 41 Atomic weight: 92.906 State: solid Group, period, block: 5, 5, d Color: gray metallic, bluish when oxidized Classification: transition metal Electron Configuration: [Kr] 4d⁴ 5s¹

Name: Molybdenum Symbol: Mo Atomic number: 42 Atomic weight: 95.96 State: solid Group, period, block: 6, 5, d Color: gray metallic Classification: transition metal Electron Configuration: [Kr] 4d⁵ 5s¹

Name: Technetium Symbol: Tc Atomic number: 43 Atomic weight: 97.91 State: solid Group, period, block: 7, 5, d Color: shiny gray metal Classification: transition metal Electron Configuration: [Kr] 4d⁵ 5s²

Name: Ruthenium Symbol: Ru Atomic number: 44 Atomic weight: 101.07 State: solid Group, period, block: 8, 5, d Color: silvery white metallic Classification: transition metal Electron Configuration: [Kr] 4d⁷ 5s¹

Name: Rhodium Symbol: Rh Atomic number: 45 Atomic weight: 102.91 State: solid Group, period, block: 9, 5, d Color: silvery white metallic Classification: transition metal Electron Configuration: [Kr] 4d⁸ 5s¹

Name: Palladium Symbol: Pd Atomic number: 46 Atomic weight: 106.42 State: solid Group, period, block: 10, 5, d Color: silvery white Classification: transition metal Electron Configuration: [Kr] 4d¹⁰

Name: Silver Symbol: Ag Atomic number: 47 Atomic weight: 107.87 State: solid Group, period, block: 11, 5, d Color: lustrous white metal Classification: transition metal Electron Configuration: [Kr] 4d¹⁰ 5s¹

Name: Cadmium Symbol: Cd Atomic number: 48 Atomic weight: 112.41 State: solid Group, period, block: 12, 5, d Color: silvery bluish-gray metallic Classification: transition metal Electron Configuration: [Kr] 4d¹⁰ 5s²

Name: Indium Symbol: In Atomic number: 49 Atomic weight: 114.82 State: solid Group, period, block: 13, 5, p Color: silvery lustrous gray Classification: post-transition metal Electron Configuration: [Kr] 4d¹⁰ 5s² 5p¹

Name: Tin Symbol: Sn Atomic number: 50 Atomic weight: 118.71 State: solid Group, period, block: 14, 5, p Color: silvery or gray Classification: post-transition metal Electron Configuration: [Kr] 4d¹⁰ 5s² 5p²

Name: Antimony Symbol: Sb Atomic number: 51 Atomic weight: 121.76 State: solid Group, period, block: 15, 5, p Color: silvery lustrous gray Classification: metalloid Electron Configuration: [Kr] 4d¹⁰ 5s² 5p³

Name: Tellurium Symbol: Te Atomic number: 52 Atomic weight: 127.60 State: solid Group, period, block: 16, 5, p Color: silvery lustrous gray Classification: metalloid Electron Configuration: [Kr] 4d¹⁰ 5s² 5p⁴

Name: Iodine Symbol: I Atomic number: 53 Atomic weight: 126.90 State: solid Group, period, block: 17, 5, p Color: lustrous metallic gray, violet as a gas Classification: halogen Electron Configuration: [Kr] 4d¹⁰ 5s² 5p⁵

Name: Xenon Symbol: Xe Atomic number: 54 Atomic weight: 131.29 State: gas Group, period, block: 18, 5, p Color: colorless gas Classification: noble gases Electron Configuration: [Kr] 4d¹⁰ 5s² 5p⁶

Name: Caesium Symbol: Cs Atomic number: 55 Atomic weight: 132.91 State: solid Group, period, block: 1, 6, s Color: silvery gold Classification: alkali metal Electron Configuration: [Xe] 6s¹

Name: Barium Symbol: Ba Atomic number: 56 Atomic weight: 137.33 State: solid Group, period, block: 2, 6, s Color: silvery gray Classification: alkaline earth metals Electron Configuration: [Xe] 6s²

Name: Hafnium Symbol: Hf Atomic number: 72 Atomic weight: 178.49 State: solid Group, period, block: 4, 6, d Color: steel gray Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d² 6s²

Name: Tantalum Symbol: Ta Atomic number: 73 Atomic weight: 180.95 State: solid Group, period, block: 5, 6, d Color: gray blue Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d³ 6s²

Name: Tungsten Symbol: W Atomic number: 74 Atomic weight: 183.84 State: solid Group, period, block: 6, 6, d Color: grayish white, lustrous Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d⁴ 6s²

Name: Rhenium Symbol: Re Atomic number: 75 Atomic weight: 186.21 State: solid Group, period, block: 7, 6, d Color: silvery-white Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d⁵ 6s²

Name: Osmium Symbol: Os Atomic number: 76 Atomic weight: 190.23 State: solid Group, period, block: 8, 6, d Color: silvery, blue cast Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d⁶ 6s²

Name: Iridium Symbol: Ir Atomic number: 77 Atomic weight: 192.22 State: solid Group, period, block: 9, 6, d Color: silvery white Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d⁷ 6s²

Name: Platinum Symbol: Pt Atomic number: 78 Atomic weight: 195.08 State: solid Group, period, block: 10, 6, d Color: grayish white Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d⁹ 6s¹

Name: Gold Symbol: Au Atomic number: 79 Atomic weight: 196.97 State: solid Group, period, block: 11, 6, d Color: metallic yellow Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s¹

Name: Mercury Symbol: Hg Atomic number: 80 Atomic weight: 200.59 State: liquid Group, period, block: 12, 6, d Color: silvery Classification: transition metal Electron Configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s²

Name: Thallium Symbol: Tl Atomic number: 81 Atomic weight: 204.38 State: solid Group, period, block: 13, 6, p Color: silvery white Classification: post-transition metal Electron Configuration:[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹

Name: Lead Symbol: Pb Atomic number: 82 Atomic weight: 207.2 State: solid Group, period, block: 14, 6, p Color: metallic gray Classification: post-transition metal Electron Configuration:[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p²

Name: Bismuth Symbol: Bi Atomic number: 83 Atomic weight: 208.98 State: solid Group, period, block: 15, 6, p Color: lustrous silver Classification: post-transition metal Electron Configuration:[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³

Name: Polonium Symbol: Po Atomic number: 84 Atomic weight: 208.98 State: solid Group, period, block: 16, 6, p Color: silvery Classification: metalloid Electron Configuration:[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴

Name: Astatine Symbol: At Atomic number: 85 Atomic weight: 209.99 State: solid Group, period, block: 17, 6, p Color: metallic Classification: halogen Electron Configuration:[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵

Name: Radon Symbol: Rn Atomic number: 86 Atomic weight: 222.02 State: gas Group, period, block: 18, 6, p Color: colorless gas Classification: noble gases Electron Configuration:[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

Name: Francium Symbol: Fr Atomic number: 87 Atomic weight: 223.02 State:solid Group, period, block: 1, 7, s Color: metallic Classification: alkali metal Electron Configuration: [Rn] 7s¹

Name: Radium Symbol: Ra Atomic number: 88 Atomic weight: 226.03 State: solid Group, period, block: 2, 7, s Color: silvery white metallic Classification: alkaline earth metal Electron Configuration: [Rn] 7s²

Name: Rutherfordium Symbol: Rf Atomic number: 104 Atomic weight: 265.12 State: solid presumably Group, period, block: 4, 7, d Color: unknown Classification: transition metal Electron Configuration: [Rn] 5f14 6d² 7s²

Name: Dubnium Symbol: Db Atomic number: 105 Atomic weight: 268.13 State: solid presumably Group, period, block: 5, 7, d Color: unknown Classification: transition metal Electron Configuration: [Rn] 5f14 6d³ 7s²

Name: Seaborgium Symbol: Sg Atomic number: 106 Atomic weight: 271.13 State: solid presumably Group, period, block: 6, 7, d Color: solid presumably Classification: transition metal Electron Configuration: [Rn] 5f14 6d⁴ 7s²

Name: Bohrium Symbol: Bh Atomic number: 107 Atomic weight: 270 State: solid presumably Group, period, block: 7, 7, d Color: unknown Classification: transition metal Electron Configuration: [Rn] 5f14 6d⁵ 7s²

Name: Hassium Symbol: Hs Atomic number: 108 Atomic weight: 277.15 State: solid presumably Group, period, block: 8, 7, d Color: unknown Classification: transition metal Electron Configuration: [Rn] 5f14 6d⁶ 7s²

Name: Meitnerium Symbol: Mt Atomic number: 109 Atomic weight: 276.15 State: solid presumably Group, period, block: 9, 7, d Color: unknown Classification: probably transition metal Electron Configuration: [Rn] 5f14 6d⁷ 7s²

Name: Darmstadtium Symbol: Ds Atomic number: 110 Atomic weight: 281.16 State: solid presumably Group, period, block: 10, 7, d Color: unknown Classification: probably a transition metal Electron Configuration: [Rn] 5f14 6d⁸ 7s²

Name: Roentgenium Symbol: Rg Atomic number: 111 Atomic weight: 280.16 State: gas Group, period, block: 11, 7, d Color: unknown Classification: probably a transition metal Electron Configuration: [Rn] 5f14 6d⁹ 7s²

Name: Copernicium Symbol: Cn Atomic number: 112 Atomic weight: 285.17 State: unknown Group, period, block: 12, 7, d Color: unknown Classification: transition metal Electron Configuration: [Rn] 5f14 6d¹⁰ 7s²

Name: Ununtrium Symbol: Uut Atomic number: 113 Atomic weight: 284.18 State: presumably a solid Group, period, block: 13, 7, p Color: unknown Class: presumably post-transition metal Electron Config: [Rn] 5f14 6d¹⁰ 7s² 7p¹

Name: Flerovium Symbol: Fl Atomic number: 114 Atomic weight: 289.19 State: presumably a solid Group, period, block: 14, 7, p Color: unknown Class: presumably post-transition metal Electron Config: [Rn] 5f14 6d¹⁰ 7s² 7p²

Name: Ununpentium Symbol: Uup Atomic number: 115 Atomic weight: 288.19 State: presumably a solid Group, period, block: 15, 7, p Color: unknown Class: presumably post-transition metal Electron Config: [Rn] 5f14 6d¹⁰ 7s² 7p³

Name: Livermorium Symbol: Lv Atomic number: 116 Atomic weight: 293 State: presumably a solid Group, period, block: 16, 7, p Color: unknown Class: presumably post-transition metal Electron Config: [Rn] 5f14 6d¹⁰ 7s² 7p⁴

Name: Ununseptium Symbol: Uus Atomic number: 117 Atomic weight: 294 State: presumably a solid Group, period, block: 17, 7, p Color: unknown Classification: unknown Electron Config: [Rn] 5f14 6d¹⁰ 7s² 7p⁵

Name: Ununoctium Symbol: Uuo Atomic number: 118 Atomic weight: 294 State: presumably a gas Group, period, block: 18, 7, p Color: unknown Classification: Non-metallic Electron Config: [Rn] 5f14 6d¹⁰ 7s² 7p⁶

Name: Lanthanum Symbol: La Atomic number: 57 Atomic weight: 138.91 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 5d¹ 6s²

Name: Cerium Symbol: Ce Atomic number: 58 Atomic weight: 140.12 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f¹ 5d¹ 6s²

Name: Praseodymium Symbol: Pr Atomic number: 59 Atomic weight: 140.91 State: solid Group, period, block: n/a, 6, f Color: grayish white Classification: lanthanide Electron Configuration: [Xe] 4f³ 6s²

Name: Neodymium Symbol: Nd Atomic number: 60 Atomic weight: 144.24 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f⁴ 6s²

Name: Promethium Symbol:Pm Atomic number: 61 Atomic weight: 144.91 State: solid Group, period, block: n/a, 6, f Color: metallic Classification: lanthanide Electron Configuration: [Xe] 4f⁵ 6s²

Name: Samarium Symbol: Sm Atomic number: 62 Atomic weight: 150.36 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f⁶ 6s²

Name: Europium Symbol: Eu Atomic number: 63 Atomic weight: 151.96 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f⁷ 6s²

Name: Gadolinium Symbol: Gd Atomic number: 64 Atomic weight: 157.25 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f⁷ 5d¹ 6s²

Name: Terbium Symbol: Tb Atomic number: 65 Atomic weight: 158.93 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f⁹ 6s²

Name: Dysprosium Symbol: Dy Atomic number: 66 Atomic weight: 162.50 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f¹⁰ 6s²

Name: Holmium Symbol: Ho Atomic number: 67 Atomic weight: 164.93 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f¹¹ 6s²

Name: Erbium Symbol: Er Atomic number: 68 Atomic weight: 167.26 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f¹² 6s²

Name: Thulium Symbol: Tm Atomic number: 69 Atomic weight: 168.93 State: solid Group, period, block: n/a, 6, f Color: silvery gray Classification: lanthanide Electron Configuration: [Xe] 4f¹³ 6s²

Name: Ytterbium Symbol: Yb Atomic number: 70 Atomic weight: 173.05 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f¹⁴ 6s²

Name: Lutetium Symbol: Lu Atomic number: 71 Atomic weight: 174.97 State: solid Group, period, block: n/a, 6, f Color: silvery white Classification: lanthanide Electron Configuration: [Xe] 4f¹⁴ 5d² 6s²

Name: Actinium Symbol: Ac Atomic number: 89 Atomic weight: 227.03 State: solid Group, period, block: n/a, 7, f Color: silvery-white Classification: actinide Electron Configuration: [Rn] 6d¹ 7s²

Name: Thorium Symbol: Th Atomic number: 90 Atomic weight: 232.04 State: solid Group, period, block: n/a, 7, f Color: silvery, often with black tarnish Classification: actinide Electron Configuration: [Rn] 6d² 7s²

Name: Protactinium Symbol: Pa Atomic number: 91 Atomic weight: 231.04 State: solid Group, period, block: n/a, 7, f Color: bright, silvery metallic luster Classification: actinide Electron Configuration: [Rn] 5f² 6d¹ 7s²

Name: Uranium Symbol: U Atomic number: 92 Atomic weight: 238.03 State: solid Group, period, block: n/a, 7, f Color: silvery gray metallic Classification: actinide Electron Configuration: [Rn] 5f³ 6d¹ 7s²

Name: Neptunium Symbol: Np Atomic number: 93 Atomic weight: 237.05 State: solid Group, period, block: n/a, 7, f Color: silvery metallic Classification: actinide Electron Configuration: [Rn] 5f⁴ 6d¹ 7s²

Name: Plutonium Symbol: Pu Atomic number: 94 Atomic weight: 244.06 State: solid Group, period, block: n/a, 7, f Color: silvery-white Classification: actinide Electron Configuration: [Rn] 5f⁶ 7s²

Name: Americium Symbol: Am Atomic number: 95 Atomic weight: 243.06 State: solid Group, period, block: n/a, 7, f Color: silvery white Classification: actinide Electron Configuration: [Rn] 5f⁷ 7s²

Name: Curium Symbol: Cm Atomic number: 96 Atomic weight: 247.07 State: solid Group, period, block: n/a, 7, f Color: silvery Classification: actinide Electron Configuration: [Rn] 5f⁷ 6d¹ 7s²

Name: Berkelium Symbol: Bk Atomic number: 97 Atomic weight: 247.07 State: solid Group, period, block: n/a, 7, f Color: silvery Classification: actinide Electron Configuration: [Rn] 5f⁹ 7s²

Name: Californium Symbol: Cf Atomic number: 98 Atomic weight: 251.08 State: solid Group, period, block: n/a, 7, f Color: silvery Classification: actinide Electron Configuration: [Rn] 5f¹⁰ 7s²

Name: Einsteinium Symbol: Es Atomic number: 99 Atomic weight: 252.08 State: solid Group, period, block: n/a, 7, f Color: silver-colored Classification: actinide Electron Configuration: [Rn] 5f¹¹ 7s²

Name: Fermium Symbol: Fm Atomic number: 100 Atomic weight: 257.10 State: solid Group, period, block: n/a, 7, f Color: unknown Classification: actinide Electron Configuration: [Rn] 5f¹² 7s²

Name: Mendelevium Symbol: Md Atomic number: 101 Atomic weight: 258.10 State: solid Group, period, block: n/a, 7, f Color: unknown Classification: actinide Electron Configuration: [Rn] 5f¹³ 7s²

Name: Nobelium Symbol: No Atomic number: 102 Atomic weight: 259.10 State: solid Group, period, block: n/a, 7, f Color: unknown Classification: actinide Electron Configuration: [Rn] 5f¹⁴ 7s²

Name: Lawrencium Symbol: Lr Atomic number: 103 Atomic weight: 262.11 State: solid Group, period, block: n/a, 7, f Color: unknown Classification: actinide Electron Configuration: [Rn] 5f¹⁴ 7s² 7p¹