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The set representing the correct order for first ionisation potential is
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The correct answer is:
\(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)
The IP decreases in a group on moving downward because atomic radius increases hence the correct order is :
\(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)
\(\mathrm{Be} \gt \mathrm{Mg} \gt \mathrm{Ca}\)
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