Question

Boron gives only covalent compounds.why?​

Answer 1

Answer:

Because of its size the sum of its first three ionization enthalpies is very high. This prevents it to form +3 ions and forces it to form only covalent compounds.

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Answer 2

Answer:

boron atomic no. is 5

E.C is 1s2 2s2 2p1 it needs 5 electrons to become stable element but boron is a metal so it doesn't gain electrons but it loses electrons and becomea stable by duplet rule so only transfer is the rule of covalent bond. Hence boron gives only covalent compounds