Atoms of elements X and Y have the electron configurations 2,5 and 2,8,5 respectively. Which deduction about these elements can be made from this information?
A The atoms are isomers.
B The atoms are isotopes.
C The elements are in the same group of the Periodic Table.
D The elements are in the same period of the Periodic Table
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as the valence electrons are the same(that is5).They belong to same group of the periodic table
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