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What is periodicity in properties of ele...

What is periodicity in properties of elements with reference to the Modern Periodic Table ? Why do all the elements of the same group have similar properties? How does the tendency of elements to gain electrons change as we move from left to right in a period ? State the reason of this change.

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Repetition of similar properties of elements after regular intervals. Because of the same number of valence electrons. It increases due to increase in effective nuclear charge, which pulls the electrons towards it.
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