Question

which atom will have the highest ionization energy? si p c n

Explanation:

Step1: Recall ionization - energy trend

Ionization energy increases across a period and decreases down a group in the periodic table.

Step2: Analyze the position of elements

Si is in period 3, group 14; P is in period 3, group 15; C is in period 2, group 14; N is in period 2, group 15.

Step3: Compare the elements

Since ionization - energy increases across a period and decreases down a group, among Si, P, C, and N, N is in the highest position (upper - right among these four) in the periodic table.

Answer:

N