33 As
Metalloid
Arsenic
Famously toxic.
Properties of Arsenic
- Atomic number (Z)
- 33
- Symbol
- As
- Atomic mass
- 74.922 g/mol
- Category
- Metalloid
- Group
- 15
- Period
- 4
- Electron configuration
- [Ar] 3d¹⁰ 4s² 4p³
- Electronegativity (Pauling)
- 2.18
- Atomic radius
- 114 pm
- First ionization energy
- 947 kJ/mol
- Melting point
- 1090 K (816.9 °C)
- Boiling point
- 887 K (613.9 °C)
- Density
- 5.776 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Known since ancient times
Frequently asked questions
What is Arsenic?
Arsenic (As) is a metalloid, element number 33 on the periodic table. Famously toxic.
What is the atomic number and atomic mass of Arsenic?
Arsenic has atomic number 33 and an atomic mass of about 74.922 g/mol.
What is the electron configuration of Arsenic?
The electron configuration of Arsenic is [Ar] 3d¹⁰ 4s² 4p³.
Where is Arsenic on the periodic table?
Arsenic sits in group 15, period 4, and is classified as a metalloid.