33
As
15
週期
4
p
個質子
電子
個中子
33
33
42
一般屬性
原子序數
33
標準原子質量
74.9216
品質編號
75
類別
類金屬
顏色
銀色
放射性
From the Latin word arsenicum, Greek arsenikon
晶體結構
簡單三角
歷史
Greek historian Olympiodorus of Thebes roasted arsenic sulfide and obtained white arsenic during 5th century AD.

Albertus Magnus is believed to have been the first to isolate the element from a compound in 1250, by heating soap together with arsenic trisulfide.

In 1649, Johann Schröder published two ways of preparing arsenic.
每個外殼的電子
2, 8, 18, 5
電子排布
[Ar] 3d10 4s2 4p3
As
Prawns are known to contain quite high levels of arsenic
物理性質
物態
固體
密度
5.776 g/cm3
熔點
1090.15 K | 817 °C | 1502.6 °F
沸點
876.15 K | 603 °C | 1117.4 °F
熔化熱
27.7 kJ/mol
汽化熱
32.4 kJ/mol
比熱容
0.329 J/g·K
地殼豐度
0.00021%
宇宙豐度
8×10-7%
Ultrapure
圖片來源: Images-of-elements
Ultrapure metallic arsenic under argon
CAS 編號
7440-38-2
Pubchem CID 編號
5359596
原子性質
原子半徑
119 pm
共價半徑
119 pm
電負性
2.18 (鲍林标度)
電離電位
9.7886 eV
原子體積
12.97 cm3/mol
熱導率
0.502 W/cm·K
氧化態
-3, 2, 3, 5
應用
The toxicity of arsenic to insects, bacteria and fungi led to its use as a wood preservative and as insecticides.

Arsenic is used in bronzing, pyrotechny, and for hardening and improving the sphericity of shot.

Gallium arsenide is a semiconductor used in laser diodes and LEDs.

Small amounts of arsenic can be used in lead alloys for ammunition.
Arsenic and its compounds are poisonous
同位素
穩定同位素
75As
不穩定同位素
60As, 61As, 62As, 63As, 64As, 65As, 66As, 67As, 68As, 69As, 70As, 71As, 72As, 73As, 74As, 76As, 77As, 78As, 79As, 80As, 81As, 82As, 83As, 84As, 85As, 86As, 87As, 88As, 89As, 90As, 91As, 92As