GC topscore question, please answer

[Marmar tala]

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Which molecule has a full octet?
1)ICl4+
2)SeF4
3)PBr4+
4)IF3
5)BrF4-

 

[lex1489]

1) I has 7 valence, 4 added through bonds - 1 for + charge = 10(over)
2) Se has 6 valence, 4 added through bonds = 10
3) P has 5 valence, 4 added through bonds - 1 for + charge = 8 (bingo)
4) I has 7 valence, 3 added through bonds = 10
5) Br has 7 valence, 4 added through bonds + 1 for - charge = 12 (over)