Chlorine atoms and Chloride ions are?

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Have an equal number of protons

Have an equal number of electrons

Form covalent bonds

React spontaneously with water

answer is A.

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Detailed Solution

Chlorine atoms and chloride ions have an equal number of protons. When a chlorine atom is converted into chloride ion, there is no change in the composition of the nucleus. A chlorine atom has one electron less than chloride ion. Chlorine atom gains one electron to form chloride ions.
Electronic configuration-
Cl⇒2,8,7
C

l^{-}

⇒2,8,8

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