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Arsenic

33
As
74.9216
Arsenic
 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance

General:

Name: Arsenic Symbol: As
Group: Non-Metal, Nitrogen group Atomic weight: 74.9216
Density @ 293 K: 5.72 g/cm3 Atomic volume: 13.1 cm3/mol
Group: Non-Metal, Nitrogen group discovered: 1600

States:

state (s, l, g): s
melting point: 886 K boiling point: K
Heat of fusion: ? Heat of vaporization: 34.760 kJ/mol

Energies:

1st ionization energy: 946.5 kJ/mole
electronegativity: 2.18 2nd ionization energy: 1797.8 kJ/mole
electron affinity: 78 kJ/mole 3rd ionization energy: 2735.4 kJ/mole
Specific heat: 0.33 J/gK heat atomization: 302 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,5 electron configuration: [Ar] 3d10 4s2 4p3
minimum oxidation number: -3 maximum oxidation number: 5
min. common oxidation no.: -3 max. common oxidation no.: 5

Appearance & Characteristics:

structure: rhombohedral color: gray
uses: photocells (GaAs), poisons toxicity:
hardness: 3.5 mohs characteristics: semimetal,brittle,3 forms

Reactions:

reaction with air: mild, w/ht =>As4O6
reaction with 6M HCl: none reaction with 6M HCl: none
reaction with 15M HNO3: mild, w/ht =>H3AsO4, NOx reaction with 6M NaOH: none

Other Forms:

number of isotopes: 1 hydride(s): AsH3
oxide(s): As2O3 chloride(s): AsCl3 AsCl5

Radius:

ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 120 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 72 pm

Conductivity:

thermal conductivity: 50.2 J/m-sec-deg
electrical conductivity: 30.03 1/mohm-cm polarizability: 4.3 A^3

Abundance:

source: Arsenopyrite, enargite (misc)
rel. abund. solar system: 0.817 log abundance earth's crust: 0.3 log
cost, pure: 320 $/100g cost, bulk: $/100g