Question

how many electrons will chlorine need to gain or lose to be left with a full outer shell of valence electrons? gain 1 lose 2 gain 3 lose 4 gain 5 lose 6 gain 7 lose 8

Explanation:

Step1: Identify chlorine's valence electrons

Chlorine has 7 valence electrons.

Step2: Determine full - shell requirement

A full outer shell of valence electrons has 8 electrons for most elements.

Step3: Calculate electron change

To get 8 valence electrons, it needs to gain \(8 - 7=1\) electron.

Answer:

A. gain 1