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

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the removal of electron does not give noble gas configuration

the electron is removed from a circular subshell

the effective nuclear charge is higher

the electron is removed from s-subshell

answer is A.

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Detailed Solution

The atomic number of calcium is 20 and the atomic number of potassium is 19.

On moving along the period, atomic size decreases and nuclear charge increases because of increasing the number of protons.

As number of protons (or effective nuclear charge) on Ca is higher than potassium, this is the reason that the first ionization potential of calcium is greater than that of potassium.

Hence, option(a) is the answer.

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