Question

why do all the elements of the same group have similar properties same period have different properties

Answer 1

Same group elements have same no of valence electrons. As valence electrons determine the compound formation of the element the have similar(not identical) chemical properties

Whereas along a period nothing that determines chemical properties is same

Answer 2

GOOD EVENING...

HERE IS YOUR ANSWER

➠➠It is the Valence electrons which play a main role in properties of element.

➠➠Elements in same group has same no of valence electrons....So they have same properties.But Elements in period don't have same no of valence electrons...So they don't have similar properties.

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