The elements in a vertical column exhibit similar chemical behaviour. This is because

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these elements have the same number of electrons in their outermost orbitals

these elements have the different number of electrons in their outermost orbitals

these elements have no electrons in their outermost orbitals

None of the above

answer is A.

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Detailed Solution

The elements in a vertical column of the periodic table constitute a group or family and exhibit similar chemical behaviour, this similarity arises because these elements have the same number and same distribution of electrons in their outermost orbitals.

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