PBr4+ octet?

[utdent20]

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How does PBr4+ form an octet?? P being the central atom would have 5 electrons.. but according to Topscore its sayis it octet.

 

[keliao]

is it 4 Br or the 4 is on top??

 

[anesthesia_209]

It is an octet.
32 total electrons. (33-1 due to +1)
24 surround the Br's and the remaining 8 form the bonds with the P, giving it an octet and a +1 charge.

 

[utdent20]

thanks on that one.. also on formal charge, how do we figure out. # of shared e and # of unshared e as in Oxygen, its has 8 total electrons but how do we get 4 shared and 4 unshared??

 

[supraman]

thanks on that one.. also on formal charge, how do we figure out. # of shared e and # of unshared e as in Oxygen, its has 8 total electrons but how do we get 4 shared and 4 unshared??

8 refers to the total number of electrons in an Oxygen atom, 2 in one shell, 6 in the outer (valence)

When you talk about Oxygen bonded to another atom, thats when you look at shared and unshared. In a CO2 molecule, one of the oxygens (can be applied to other O of course) has 4 unbonded electrons (2 lone pairs) and 4 bonding electrons (shares 2 pairs of electrons) for a total of 4 bonding electrons...