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 in a period? State the reason of this change. [3 marks]
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periodicity is the repetition of elements with similar properties when they are arranged according to their atomic no. in the periodic table. all elements of the same group have the similar properties because because they have similar outer electronic configuration.
Elements in the same group or column have the same number of electrons in their outermost shell. ... On moving across a period from left to right, the tendency to gain electrons increases. This is due to an increase in the nuclear pull and a decrease in atomic size.
Tendency to gain electrons increases as we go from left to right in a period because the effective nuclear charge increases and the atomic radius decreases.
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