Question

check each element that is not balanced. \\( 5\text{li} + \text{n}_2 \
ightarrow 2\text{li}_3\text{n} \\) \\( \text{li} \\) \\( \text{n} \\) none of these. the reaction is balanced.

Explanation:

Step1: Count Li on both sides

Left side: \( 5 \) Li (from \( 5\text{Li} \)).
Right side: \( 2 \times 3 = 6 \) Li (from \( 2\text{Li}_3\text{N} \), since each \( \text{Li}_3\text{N} \) has 3 Li).

Step2: Count N on both sides

Left side: \( 2 \) N (from \( \text{N}_2 \)).
Right side: \( 2 \times 1 = 2 \) N (from \( 2\text{Li}_3\text{N} \), each has 1 N).

Answer:

Li (since Li atoms are not balanced: 5 on left, 6 on right; N is balanced)