On left, C l with 2 black dots each above, left, and below and 1 black dot right. On the right, C l with 2 black dots each above, right, and below and 1 black dot left. Chlorine, which is used to clean swimming pools, exists as two chlorine atoms covalently bonded to each other.

How many valence electrons does one chlorine (Cl) atom have?

Chlorine has seven valence electrons

Explanation:

The dot structure of chlorine was just described in the question. The two dots above, below and by the left are three lone pairs making a total of six electrons. There is another one black dot indicating one electron.

This one electron on both chlorine atoms combine to form the chlorine molecule Cl2.

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