Question

why Boron form 4 covalent bond
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Answer 1

Carbon, with four outer electrons, and nitrogen with five, form triple covalent bonds consisting of six shared electrons, or three pairs. Boron has three outer electrons, so in principle should be capable of this too, but it has remained aloof. ... Boron can hold up to eight outer electrons: a pair in each of four slots

Answer 2

because it has only 4 electrons in its outermost shell(valence shell) and can only share the ekectrons

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