33 As Arsenic 74,922 u

Arsenic

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Période
4
Groupe
15
Bloc
p-bloc
Phase (STP)
Solid

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

Apparence: Metallic grey

About Arsenic

Known since antiquity and historically notorious as a poison, arsenic is a metallic-grey metalloid of atomic number 33 and atomic mass 74.922. It is a brittle solid with a density of 5.73 g/cm³. Five valence electrons ([Ar] 3d10 4s2 4p3) give an electronegativity of 2.18 and a first ionization energy of 947 kJ/mol. Albertus Magnus is credited with describing the element around 1250. Despite its toxicity, arsenic has practical uses in semiconductors and, historically, in wood preservatives. It sits in group 15, period 4, sharing that group with nitrogen and phosphorus.

Propriétés physiques

Masse atomique 74.922 u
Densité 5.727 g/cm³
Point de fusion 816.9 °C
Point d'ébullition 613.9 °C
Phase à STP Solid
Rayon atomique 114.0 pm

Propriétés électroniques

Électronégativité 2.18
Énergie d'ionisation 947.0 eV
Affinité électronique 78.2 eV
Électrons de valence 5

Configuration électronique

Configuration [Ar] 3d¹⁰ 4s² 4p³

Electron Shell Configuration

Arsenic electron shell configuration As 2e⁻ 8e⁻ 18e⁻ 5e⁻
Electron shell structure of Arsenic — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 5

Position in Periodic Table

Arsenic position in the periodic table As

Découverte

Découvert par: Albertus Magnus
Année: 1250

Bloc et période

Bloc

s p d f

Période

1 2 3 4 5 6 7

Tableau périodique

Lanthanides Actinides

Compounds Containing Arsenic

Gallium Arsenide

GaAs

Arsine

AsH₃

Plus de Métalloïde

5 B Boron 14 Si Silicon 32 Ge Germanium 51 Sb Antimony 52 Te Tellurium

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 métalloïde.
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.