Arsenic was discovered by Albertus Magnus (Germany) in 1250.
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: 4s2 3d10 4p3
2,8,18,5
Physical properties
Density: 5.727 g/cm-3
Melting point: no data
Boiling point: no data
Atomic properties
Oxidation states: 5, 3, 2, 1,[2] -3
Electronegativity: 2.18 (Pauling scale)
Ionization energies: 1st: 947.0 kJ·mol-1
Covalent radius: 119±4 pm
Van der Waals radius: 185 pm
- As
Electron Configuration
Isotopes
There is one naturally occurring isotope of arsenic exists, 75As.