Arsenic

Statistics:

• Name: Arsenic
• Symbol: As
• Classification: Metalloid
• Atomic Number: 33
• Atomic Mass: 74.9216 g/mol
• Density: 5.72 g/cm³
• Melting: 613°C
• Boiling: 613°C
• Protons & Electrons:33
• Neutrons:42
• Discovered: 1250
• Discovered By: Albertus Magnus
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 5

Isotopes:

Isotope: Half-life

• ⁷¹As: 65.28 hours
• ⁷²As: 26.0 hours
• ⁷³As: 80.30 days
• ⁷⁴As: 17.77 days
• ⁷⁵As: stable
• ⁷⁶As: 1.0778 days
• ⁷⁷As: 38.83 hours
• ⁷⁹As: 9.01 minutes

Brief Summary

Arsenic is a Metalloid with the symbol 'As' and contains 33 Protons & Electrons with 42 neutrons in the nucleus of the atom. Arsenic has an atomic mass of 74.9216 g/mol and, at a temperature of 20°C, has a density of 5.72 g/cm³. It will melt at a temperature of 613°C and boil at 613°C.

Arsenic was discovered by Albertus Magnus in 1250 and is named 'Arsenic' Greek word "arsenikos" and the Latin word "arsenicum".

Some common usages for Arsenic: poison, conducts electricity and semiconductors.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Arsenic :: As :: 33 - Chemical Element. 11 Mar. 2010 <http://www.chemicalelement.com/element/arsenic.html>.