Chemical Elements.com - Arsenic (As)

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Basic Information

Name: Arsenic
Symbol: As
Atomic Number: 33
Atomic Mass: 74.9216 amu
Melting Point: 817.0 °C (1090.15 K, 1502.6 °F)
Boiling Point: 613.0 °C (886.15 K, 1135.4 °F)
Number of Protons/Electrons: 33
Number of Neutrons: 42
Classification: Metalloid
Crystal Structure: Rhombohedral
Density @ 293 K: 5.72 g/cm³
Color: Gray

Atomic Structure

Number of Energy Levels: 4

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Isotopes

Isotope	Half Life
As-71	2.7 days
As-72	26.0 hours
As-73	80.3 days
As-74	17.8 days
As-75	Stable
As-76	26.3 hours
As-77	39.0 hours
As-79	9.0 minutes

Facts

Date of Discovery: Known to the ancients
Discoverer: Unknown
Name Origin: From the Greek word arsenikos and the Latin word arsenicum
Uses: Poison, conducts electricity, semiconductors
Obtained From: mispickel

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