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Scrie elementele 16S,6C,17Cl,9F...in sensul creşteri

Răspuns :

Z=6C 1s2/2s2 2p2
Z=9F 1s2/2s2 2p5
Z=16S
1s2/2s2 2p6/3s2 3p4
Z=17Cl
1s2/2s2 2p6/3s2 3p5