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Introduction to p Block Elements

An element ...

Question

An element $X$ belongs to group III-A and 4th period in the periodic table. Find out the atomic numbers of $X$ and the element which is placed just below $X$ in the periodic table.

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Solution

The element which is in III A group and 4th period is Gallium. The atomic number is 31. The element just below Gallium is Indium (49).

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