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Arsenic at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

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

[Bohr Model of Arsenic]  
Number of Energy Levels: 4

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 5


Isotope Half Life
As-712.7 days
As-7226.0 hours
As-7380.3 days
As-7417.8 days
As-7626.3 hours
As-7739.0 hours
As-799.0 minutes


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

Related Links

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MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Arsenic. <http://www.chemicalelements.com/elements/as.html>.

For more information about citing online sources, please visit the MLA's Website.

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