what is periodicity in elements with reference to the modern periodic table ? why do all the elements of the same group have same properties?
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the element of same group have same properties because :-
1.valence electrons in outermost shell
2.valency
3.size of an atom or atomic size
4.
1.valence electrons in outermost shell
2.valency
3.size of an atom or atomic size
4.
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