Question

The first ionisation enthalpy of calcium is greater than that of potassium because for calcium

• A. the electron is removed from $s-$ ubshell
• B. the effective nuclear charge is higher
• C. the electron is removed from a $p-$ subshell
• D. the removal of electron does not give noble gas configuration.

Answer 1

Answer: (B)

Higher the effective nuclear charge, greater is the ionisation enthalpy.