Question

why nitrogen is trivalent

Answer 1

its because of its electonic configuration either it can lose 3 electrons are can gain 5 electrons to complete its octet

Answer 2

because it has 7 electron ...means the configuration is (2,5)
which means to gain the nearest inert gas configuration it sholud have 3 more electrons to gain stability ...thus it makes 3 bonds ans hence is trivalent...