^{2}2s

^{2}2p

^{5}

Cl:1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{5}

Br:1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}4s

^{2}3d

^{10}4p

^{5}

^{}All of the halogens end with 5 electrons in an outer p shell.

2. Li: 1s

^{2}2s

^{1}

Na: 1s

^{2}2s

^{2}2p

^{6}3s

^{1}

K: 1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}4s

^{1}

All of the alkali metals end with a single electron in their outer s shell.

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