topscore gchem -> octet

[arginine1]

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Came across this question in topscore test 3 (#47):

Which of the following has an octet on the central atom:

a) ICl4 +
b) SeF4
c) PBr4 +
d) IF3
e) BrF4 -

Their answer is C but there is no explanation really. Can anyone enlighten me as to why the answer can't be e?

 

[suhshi]

Came across this question in topscore test 3 (#47):

Which of the following has an octet on the central atom:

a) ICl4 +
b) SeF4
c) PBr4 +
d) IF3
e) BrF4 -

Their answer is C but there is no explanation really. Can anyone enlighten me as to why the answer can't be e?

E has a total of 36 electrons
extra electrons would have to be placed on the central atom

choice C is the only one where a full octet is around the central atom

 

[kkmaths90]

Draw the Lewis structure for each and you will get your answer C. 🙂

PBr4 + >> 32 e
IBr4 + >> 34 e
SeF4 >> 34 e
IF3 >>> 28e
BrF4 - >> 29e

Draw Lewis of each and you will know

 

[arginine1]

I get it now thank you guys!