The elements with atomic numbers 4, 12, 20, 38 and 56 belong to

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alkaline earth metals

noble gases

halogens

alkali metals

answer is B.

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Detailed Solution

The atomic numbers of the elements in group-2 are Beryllium (4), Magnesium (12), Calcium (20), Strontium (38), and Barium (56). These elements are belongs to the group 2 which is group of alkaline earth metals

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