An element X belongs to group IIA and the fourth period in the periodic table. Find out the atomic number of X and the element which is placed just below X in the periodic table.

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Solution

Element X is placed in the fourth period, which means it has four shells.
Since, the group number is IIA that means the valence shell contains 2 electrons.
Hence, the electronic configuration of element X should be 2, 8, 8, 2.
The element with atomic number 20 is Calcium.
The element lying below element X (Calcium) is Strontium (Sr).

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