Why this is not correct ? Cl(17)=1s2 2s2 2p6 3s1 3p6?

Why cant we write this electronic configuration for chlorine? or:Why can't we write this electronic configuration for chlorine?or:Each shell must have

Why can't we write this electronic configuration for chlorine?

or:Why can't we write this electronic configuration for chlorine?

or:Each shell must have an even number of electrons before the next shell gets one. That is because spins are paired.

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