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Question

How many valence electrons are in an atom of Magnesium?


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Solution

Valence electron:

  1. Valence electrons are electrons in the outermost shell of an atom.
  2. Atoms with a full valence shell of electrons are the most stable.
  3. They are determined by the electronic configuration of an atom.
  4. Magnesium has an atomic number =12 so its electronic configuration is 1s22s22p63s2
  5. The outer shell 3s is completely filled with 2electrons.

Therefore, number of the valence electron in magnesium is 2


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