Why do elements in the same group have similar physical and chemical properties?
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Elements in same group have similar physical and chemical property because their atoms have same number of electron's in highest occupied level So, they have similar properties.
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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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