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Question

The valence shell electronic configuration of magnesium is ________


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Solution

  1. Valence shell: It is the shell that is filled at the last while writing the electronic configuration.
  2. The atomic number of magnesium (Mg) is 12.
  3. Electronic configuration of Mg is 1s22s22p63s2.
  4. Hence, the valence shell of Mg is ‘3s’ and the number of electrons in the valence shell of magnesium is 2.
  5. Therefore, the valence shell electronic configuration of magnesium is 3s2.

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