Question

The element having the highest first ionization enthalpy is

• A. Si
• B. Al
• C. N
• D. C

Answer 1

Answer: (C)

N

Answer 2

The order of first ionization enthalpy ($I_{E_1}$) for these elements is:
$\text{Al} < \text{Si} < \text{C} < \text{N}$

Thus, nitrogen ($\text{N}$) has the highest first ionization enthalpy among the given options.

The Correct Answer is: N