Answer
Potassium nitride= K3N
Explanation
Potassium nitride is the correct name of the compound with chemical formula, K3N. The compound is formed between potassium ion (K+) and nitride ion (N-3).
Potassium has nineteen electrons and since it obeys octet rule with electronic configuration of 1s2 2s2 2p6 3s2 3p6 4s1. Potassium loses an electron in its outer subshell(4s) to attain a stable electronic configuration (1s2 2s2 2p6 3s2 3p6). Thus, forming K+.
On the other hand, N has seven electrons with electronic configuration of 1s2 2s2 2p3. Nitrogen also obeys octet rule. Hence, it acquires three electrons to attain a stable octet noble gas configuration (1s2 2s2 2p6), resulting in N-3.
Every nitrogen atom acquires three electrons from potassium. Also, potassium loses one electron to each nitrogen atom. In this interaction every nitrogen atom becomes N-3 and each potassium becomes K+.
