why the element of same group have similar chemical properties and why the element of same period have different properties
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elements of same group have similar chemical properties because they have same valence electrons and same valency.
element of same period have different properties because they have different valency and valence electrons.
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The chemical and physical properties of any elements rely on the quantity of valence electrons. In periodic table elements are in same group are having same quantity of valence electrons. This is why elements present in the same group are having similar chemical and physical properties.
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