Question

When the elements C, N, and Si are arranged in order of increasing first ionization energy, what is the correct order ?

• A. C < N < Si
• B. N < C < Si
• C. Si < C < N
• D. Si < N < C

Answer 1

The correct option is C Si < C < N

Nitrogen will have highest IE. In $C$ and $Si,C$ will have higher IE because down the group IE decreases. The order will be $Si<C<N$.