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2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d
6s 6p
7s
dicoret kearah samping,misalnya
15X=1S^2,2S^2,2P^6,3S^2,3P^3.
GOLONGAN 5A PERIODA 3,
n=3,l=1,m=0,s=+1/2