33 As Arsenic 74.922 u

Arsenic

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Period
4
Group
15
Block
p-block
Phase (STP)
Solid

Arsenic is a metalloid known since antiquity, historically notorious as a poison. It is used in semiconductors and wood preservatives.

Appearance: Metallic grey

Physical Properties

Atomic Mass 74.922 u
Density 5.727 g/cm³
Melting Point 816.9 °C
Boiling Point 613.9 °C
Phase at STP Solid
Atomic Radius 114.0 pm

Electronic Properties

Electronegativity 2.18
Ionization Energy 947.0 eV
Electron Affinity 78.2 eV
Valence Electrons 5

Electron Configuration

Configuration [Ar] 3d¹⁰ 4s² 4p³

Electron Shell Configuration

Arsenic electron shell configuration As 2e⁻ 8e⁻ 18e⁻ 5e⁻

Position in Periodic Table

Arsenic position in the periodic table As

Discovery

Discovered by: Albertus Magnus
Year: 1250

Periodic Table

Lanthanides Actinides

Compounds Containing Arsenic

More Metalloid

Frequently Asked Questions

What is Arsenic?
Arsenic (As) is a chemical element with atomic number 33. It is a solid at standard temperature and pressure, classified as a metalloid.
What are the key properties of Arsenic?
Arsenic has an atomic mass of 74.922 u, density of 5.727 g/cm³, melting point of 816.9°C, boiling point of 613.9°C.
What is the electron configuration of Arsenic?
The electron configuration of Arsenic is [Ar] 3d10 4s2 4p3. It is in the p-block of the periodic table.
Who discovered Arsenic?
Arsenic was discovered by Albertus Magnus in 1250.
What is the electronegativity of Arsenic?
Arsenic has an electronegativity of 2.18 on the Pauling scale.