First, second and third IP values are 100 eV, 150 eV, and 1500 eV. The element can be:

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Solution

The correct option is B Be
From given data, it can be seen that the difference of $I P_{2}$ and $I P_{3}$ is maximum.
So its valency = 2 (2 valence electron) and generally group 2 has valency = 2
Group = 2 means family = alkaline earth metal family.
Among the given options Be belongs to this family.

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