What is periodicity in properties of elements with reference to the modern periodic table why do all the element to gain electrons change as we move from left to right in a period state the reason of this change
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The repetition of properties of elements after regular intervals , when the elements are arranged in the order of their increasing atomic mass is called periodicity.
Elements gain electrons as we move from left to right along a period , this is due to an increase in nuclear charge which tends to pull the valence electrons closer to the nucleus and reduces the size of the atom
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