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Question

How many valence electrons are in an atom of chlorine?


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Solution

Valence electron:

  1. Valence electrons are the electrons in the outermost shells.
  2. The most stable atoms have a full valence shell of electrons.
  3. They are determined by an atom's electrical configuration.
  4. Atomic number of chlorine=17 so its electronic configuration =1s22s22p63s23p5
  5. Chlorine has 3s2,3p5 as its outermost shell.

Therefore, the number of valence electrons=7.


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