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1s 2s 2p 3s 3p
Valence Electrons- the electrons in the outermost energy level
2p 3s 3p 1s 2s
1s 2s 2p 3s 1s 2s 2p 3s
3p 4s
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1s 2s 2p 3s 3p
4s 3d 4p
1s 2s 2p 3s 3p