How many valence electrons are in an atom of chlorine?

The atomic number of chlorine is 17. Hence it has 2 electrons in its inner-most shell, 8 electrons in its second shell and 7 electrons in outer-most shell respectively.

Valence electrons

Electrons in the outer shells that are not filled are called valence electrons.

The atomic number of chlorine is 17. Hence it has got 7 electrons in its outermost shell.

Answer

There are 7 valence electrons in the chlorine atom.

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