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el123

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## Homework Statement

The electron configuration for three neutral atoms are as follows.

A.1s

^{2}2s

^{2}2p

^{3 }

B.1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}4s

^{2}3d

^{10}4p

^{5}5s

^{2}4d

^{7 }

C.1s

^{2}2s

^{2}2p

^{6}3s

^{2}3p

^{6}4s

^{2}3d

^{6}

Indicate which are valence orbitals.

## The Attempt at a Solution

A.2s

^{2}2p

^{3}

B.4p

^{5}4d

^{7}

C.4s

^{2}

Please check if i have this corrrect.