Exceptions to the octect rule?

Which of the following compounds present exceptions to the octet rule ?








a) NH4+








b) XeF4O








c) XeO4








d) ClO3-








e) NF3








you must enter all true statements alphabetically in one lower case group,


e.g., if a) b) and e) are true you would enter abe

Exceptions to the octect rule?
b

















None of the others violate the octet rule b/c four or less atoms are bonded to them.
Reply:I just realized its O3 - not O 3-.





in that case the answer is only b.
Reply:be