Negative electron gain ethalpy of fluorine atom is less than that of chlorine atom. Why?

K_b value of aniline is less than that of methyl amine. Why?

Explain the following: Electron gain enthalpy for oxygen is less negative than that for sulphur.

What do you understand by electron affinity of an element ? Why electron affinity of chlorine is more than that of fluorine.

Why is the density of nucleus more than that of the atom?

State modern periodic law. What do you understand by first ionization potential? "The first ionization energy of nitrogen atom is greater than that of oxygen atom" Explain