Arsenic

Arsenic (pronounced /ˈɑrsnɪk/, ARS-nik; also /ɑrˈsɛnɪk/, ar-SEN-ik when attributive) is the chemical element that has the symbol As, atomic number 33 and atomic mass 74.92. Arsenic was first documented by Albertus Magnus in 1250. Arsenic is a notoriously poisonous metalloid with many allotropic forms, including a yellow (molecular non-metallic) and several black and grey forms (metalloids). Three metalloidal forms of arsenic, each with a differen... more

Chemical Element

The 33rd Element in the Periodic Table

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Germanium (pronounced /dʒərˈmeɪniəm/, jər-MAY-nee-əm) is a chemical element with the symbol Ge and atomic number 32. It is a lustrous, hard, grayish...

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Selenium

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Symbol:

  • As

Atomic mass:

Mass Uncertainty
  • 74.9216 u (1.2441E-16 µg )
  • 0.00002 u (3.3211E-23 µg )

Electron affinity:

Value Uncertainty
  • 0.814 eV (8.14E-7 MeV )
  • 0.008 eV (8E-9 MeV )

Electronegativity (Pauling scale):

  • 2.18

Covalent radius:

  • 1.19 pm (4.69E-8 )

Van der Waals radius:

  • 205 pm (0.00000807 )

Melting Point:

  • 816.85 °C (1502.3 °F )

Boiling Point:

  • 602.85 °C (1117.1 °F )

Chemical series:

Periodic table block:

Ionization Energy:

  • 9.7886 eV (0.0000097886 MeV )

Discovery Date:

  • 800 C.E.

Electron Configuration:

  • Ar 3d10 4s2 4p3

Discoverer:

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