Question

Which one is not correct statement?

• A. of He is maximum among all elements
• B. for noble gases is zero
• C. Electronegativity is maximum for fluorine
• D. for N < for O

Answer 1

The correct option is D

for N < for O

As we discussed Ionization Enthalpy, it decreases down the group because of increase in atomic size and of Noble gases are highest because they are very stable.

$\to$ Therefore $I{E}_1$ of He is maximum.

$\Rightarrow$ $I{E}_1$ of noble gases is zero, theoretically because they are very stable and they do not want addition of electron.

$\Rightarrow$ As we know, electronegativity increases along the period and decreases down the group (except noble gases), therefore fluorine has maximum electronegativity.

$\Rightarrow$ $I{E}_1$ for N > $I{E}_1$, for O

Because N has half filled P orbitals, that's why it is stable. Therefore, removing an electron is harder in case of N than O.