Q5:- (a) What is meant by periodidity in propeties of elements with reference to the periodic table? (b) Why do all the elements of the same group haye similar properties?
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Repetition of properties after a certain interval is called periodicity of properties. If elements are arranged in increasing order of their atomic number in the periodic table, then elements repeat its properties after a definite interval.This repetition of properties is known as periodicity of properties.
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