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Chlorine has 17+ Prontons & 17- Electrons

Energy levels go 2e - 8e - 18e - 32e

So Chlorine has 2 in the first shell which leaves 15 (17e-2e = 15)

So that means 8 in the second shell which leaves 7 (15e-8e = 7)

That leaves 7 in the third shell

The answer is 8

Anything with 10 or more electrons or an atomic # 10 or more would have 8 for the second shell.

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