In the periodic table, elements of group shows similarities in their chemical properties. due to

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Differences in the number of protons in the nucleus of the atom

Similarities in the electronic arrangement of the atom

Similarities in the results of emission spectrum analysis of gaseous samples of a group

Differences in the number of neutrons in the nucleus of the atoms

answer is B.

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Detailed Solution

Similarities in properties of elements in a group is due to their similar electronic configuration in valence shell.

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