Question

Why is there a gradual increase in the ionisation energy from $Li$ to $Ne?$

• A. Increase in atomic size
• B. Decrease in nuclear charge
• C. Atomic size remains same
• D. Increase in nuclear charge

Answer 1

The correct option is D Increase in nuclear charge

There a gradual increase in the ionisation energy from $Li$ to $Ne$ due to increasing in nuclear charge. With an increase in the atomic number, the nuclear charge increases. The added electrons shield each other poorly from the nucleus. The effective nuclear charge increases, the atomic radii decreases and the ionisation enthalpy increases.