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pasangan elektron =PE
pasangan elektron ikatan=PEI
pasangan elektron pusat=PEP
pasangan elektron bebas=PEB
jwb
PE=1×5+4×7+3
2
=5+28+3
2
=36
2
=18
PEP=jlh atom-1
=5-1
=4
PEP=pasangan elektron-(3×jlh atom ujung)
= 18-(3×4)
=18-12
=6
PEB=PEP-PEI
=6-4
=2
jdi molekul ikatan PCl4 pngkat3- yaitu AX4E2