شابلون:Infobox arsenic

Arsenic, ₃₃As
General properties
Pronunciation	/ˈɑrs[invalid input: 'ᵻ']nɪk/, also /ɑrˈsɛnɪk/ when attributive ; AR-sə-nik, ar-SEN-ik
Allotropes	grey (most common), yellow, black
Appearance	metallic grey
Arsenic in the periodic table
germanium ← arsenic → selenium	‍
Atomic number (Z)	33
Group, period	group 15 (pnictogens), period 4
Block	p-block
Element category	metalloid
Standard atomic weight (Ar)	74.921595(6)
Electron configuration	[Ar] 3d10 4s2 4p3
Electrons per shell	2, 8, 18, 5
Physical properties
Phase	solid
Sublimation point	887 K (615 °C, 1137 °F)
Density near r.t.	5.727 g/cm3
when liquid, at m.p.	5.22 g/cm3
Triple point	1090 K, 3628 kPa
Critical point	1673 K, ? MPa
Heat of fusion	grey: 24.44 kJ/mol
Heat of vaporization	34.76 kJ/mol (?)
Molar heat capacity	24.64 J/(mol·K)
Atomic properties
Oxidation states	5, 4, 3, 2, 1, −1, −2, −3 (a mildly acidic oxide)
Electronegativity	Pauling scale: 2.18
Ionization energies	1st: 947.0 kJ/mol ; 2nd: 1798 kJ/mol ; 3rd: 2735 kJ/mol ; (more)
Atomic radius	empirical: 119 pm
Covalent radius	119±4 pm
Van der Waals radius	185 pm
Miscellanea
Crystal structure	rhombohedral
Thermal expansion	5.6 µm/(m·K) (at r.t.)
Thermal conductivity	50.2 W/(m·K)
Electrical resistivity	333 nΩ·m (at 20 °C)
Magnetic ordering	diamagnetic
Magnetic susceptibility (χmol)	−5.5·10−6 cm3/mol
Young's modulus	8 GPa
Bulk modulus	22 GPa
Mohs hardness	3.5
Brinell hardness	1440 MPa
CAS Number	7440-38-2
تاریخی
Discovery	ca. 800
Main isotopes of arsenic
γ	–
β+	74Ge
γ	–
β−	74Se
	باخ; دانیش; دییش; \| references \| in Wikidata

PTArsenic

Ge ← i'box Ge	iso 33As E infobox E isobox	→ Se i'box Se
Commons Wiktionary Wikidata:Q871 Indexes in PT: § below ·Page
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