Why do all the elements of the (a) same group have similar properties, (b) same period have different properties?
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Answer:
(a) Elements of same group have similar properties due to same number of valence electrons, therefore, they have same valency.
(b) Elements of same period have different properties as they differ in number of valence electrons.
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Explanation:
Periodic Classification of Elements. ... a) Elements in the same group have similar properties because they have the same number of valence electrons in their outermost shell. b) Elements in the same period have different properties because the number of valence electrons in their outermost shells differ.
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