(1) Why do all the elements of same group have similar properties? (2) How will the tendency to gain electrons change as we go from teft to right across a period.
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(1)
i) All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell.
(ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms
(2)
Tendency to gain electrons increases as we go from left to right in a period because the effective nuclear charge increases and the atomic radius decreases.
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