33 As Arsenic 74.922 u

Arsenic

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周期
4
族
15
ブロック
p-ブロック
相 (STP)
Solid

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

外観: 金属灰色

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.

物理的特性

原子質量 74.922 u
密度 5.727 g/cm³
融点 816.9 °C
沸点 613.9 °C
STPにおける相 Solid
原子半径 114.0 pm

電子的特性

電気陰性度 2.18
イオン化エネルギー 947.0 eV
電子親和力 78.2 eV
価電子 5

電子配置

配置 [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

発見

発見者: Albertus Magnus
年: 1250

ブロックと周期

ブロック

s p d f

周期

1 2 3 4 5 6 7

周期表

ランタノイド アクチノイド

Compounds Containing Arsenic

Gallium Arsenide

GaAs

Arsine

AsH₃

半金属 をもっと見る

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 半金属.
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.