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p=11
e=11
n= 12
1s2 2s2 2p6 3s1
Cl
p= 17
e=17
n=18
1s2 2s2 2p6 3s2 3p5
Ca
p=20
e=20
n=20
1s2 2s2 2p6 3s2 3p6 4s2
F
p=9
e=9
n=10
1s2 2s2 2p5