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Elements

Selenium - Se

The element Selenium, atomic number 34, is formed from Type II supernova, which results from star core collapse.

      1. Name:
      2. Selenium
      1. Symbol:
      2. Se
      1. Atomic number (protons):
      2. 34
      1. How created:
      2. Type II supernova
      1. Process:
      2. star core collapse
      1. Group (column):
      2. 16
      1. Period (row):
      2. 4
      1. Atomic weight:
      2. 78.971000000
      1. Melting point:
      2. 453 K
      1. Boiling point:
      2. 958 K
      1. Density:
      2. 4.8090000 g/cm3

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