Please Explain why indetails. Read the following statements: BF3 and PF5 are exa

Question

Please Explain why indetails. Read the following statements: BF3 and PF5 are examples of violations of the octet rule. BF4- and BF3-NH3 are examples of violations of the octet rule. Expanded valance shells occur most often when the central atom is bonded to a small, electronegative element. The central atoms most capable of having expanded valence shells come from rows 3, 4, and 5 of the periodic table. Only statements 1, 3,and 4 are correct. Only statements 1 and 4 are correct. Only statements 2, 3, and 4 are correct. Only statements 3 and 4 are correct. Only statements 2 and 4 are correct.

Explanation / Answer

1) is true. BF3 has 3 pairs of electrons (not 4!) 2) no true, BF4- has 4 pairs of electrons around the central B 3) no, this takes even more electron density from the central atom,so it will not be able to get another electronegative element 4) yes, these are the larger atoms Answer is B)

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