33
As
Arsenic
Arsenic
Arsenic (As)
Metalloids · Solid · Period 4 · Group 15
Element Properties
- Atomic Number
- 33
- Symbol
- As
- Atomic Mass
- 74.9216
- Category
- Metalloids
- Standard State
- Solid
- Period
- 4
- Group
- 15
- Electronegativity
- 2.18
- Atomic Radius
- 185
- Ionization Energy
- 9.81
- Electron Affinity
- 0.81
- Oxidation States
- +5, +3, -3
- Melting Point
- 1090 K (816.85 °C)
- Boiling Point
- 887 K (613.85 °C)
- Density
- 5.776
- Electron Configuration
- [Ar]4s2 3d10 4p3
- Year Discovered
- Ancient
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Frequently asked questions
What is the atomic number of Arsenic?
The atomic number of Arsenic is 33, which equals the number of protons in its nucleus.
What is the atomic mass of Arsenic?
The atomic mass of Arsenic is approximately 74.9216 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Arsenic?
The electron configuration of Arsenic is [Ar]4s2 3d10 4p3.
Where is Arsenic in the periodic table?
Arsenic is located in period 4, group 15.
When was Arsenic discovered?
Arsenic has been known since antiquity.
Related elements
Same group
7
N
Nitrogen
14.007
15
P
Phosphorus
30.974
51
Sb
Antimony
121.76
83
Bi
Bismuth
208.98
115
Mc
Moscovium
290.196