The elements in a vertical column exhibit similar chemical behaviour. This is because
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a
these elements have the same number of electrons in their outermost orbitals
b
these elements have the different number of electrons in their outermost orbitals
c
these elements have no electrons in their outermost orbitals
d
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.