Question

Ionization Potential increases over a period from left to right because the:

• A. atomic radius increases and nuclear increases
• B. atomic radius decreases and nuclear charge decreases
• C. atomic radius increases and nuclear charge decreases
• D. atomic radius decreases and nuclear charge increases

Answer 1

The correct option is D atomic radius decreases and nuclear charge increases

As we move from left to right in a period, electrons are added to the same shell. As the number of electrons and protons goes on increasing the attraction goes on increasing and atomic size decreases.Thus the outermost shell electrons come closer to the nucleus and are more firmly bound.Thus, more amount of energy is required to remove an electron from the outermost shell and hence, Ionisation Potential increases.