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17Cl = 2 8 7
PE =3
PEB = 5-3/2 =1
PEI =4
sifatnya Segitiga piramida , senyawa polar , memiliki 1 peb
12. (1/2)^m =1/4
m =2
(1/2)^n = 2/4.
n=1
jadi v =r(No)^2(br2)