Arsenic

Metalloid

Symbol: As
Atomic number: 33
Atomic mass: 74.92159
Group: Non-Metal
CAS-number: 7440-38-2

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Electronic data

Shells: 2, 8, 18, 5
Orbitals: [Ar] 3d¹⁰ 4s² 4p³
Electronegativity: 2.0, 2.2
1. Ionization potential: 9.8152 eV
2. Ionization potential: 18.633 eV
3. Ionization potential: 28.351 eV
Oxidation states: 5, 3, -3
Electrical conductivity: 0.0345 10^6

Thermal data

Melting point: 817 °C @ 28 atmos.
Boiling point: 613 °C Sublimes at
Specific heat: 0.33 J/gK
Heat of fusion: -- kJ/mol
Heat of vaporization: 34.760 kJ/mol
Thermal conductivity: 0.500 W/cmK

Steric data

Atomic radius: 1.33 Å
Ionic radius: 0.58 Å (+3)
Covalent radius: 1.20 Å
Atomic volume: 13.1 cm³/mol
Density (293 K): 5.72 g/cm³
Crystal structure: rhombohedral

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
⁷¹As	0	71	5/2	2.72d	EC, β+	View
⁷²As	0	72	2	26.0h	β+, EC	View
⁷³As	0	73	3/2	80.3d	EC	View
⁷⁴As	0	73.924	2	17.78d	EC, β+, β-	View
⁷⁵As	100	74.9216	3/2	--	--
⁷⁶As	0	75.922	2	26.3h	β-	View
⁷⁷As	0	76.921	3/2	38.8h	β-	View

Name origin:	Greek: arsenikon; Latin: arsenicum, (both names for yellow pigment)
Description:	Steel-gray, brittle semi-metal.
Discovered by:	Known to the ancients
Year:	--
Place:	Unknown
Sources:	Found in mispickel (arsenopyrite).
Use(s):	Many of its compounds are deadly poison and used as weed killer and rat poison. Conducts electricity and used in semiconductors. Some compounds, called arsenides, are used in the manufacture of paints, wallpapers, and ceramics.

Arsenic

Physical data

Electronic data

Thermal data

Steric data

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