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Explanation:
periodicity refers to trends or recurring variations in element properties with increasing atomic number. Periodicity is caused by regular and predictable variations in element atomic structure.
Elements in the same group (in the periodic table) have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level. Group 1 elements are reactive metals called the alkali metals. Group 0 elements are unreactive non-metals called the noble gases.
The tendency to gain electron increases as we go from left to right in a period because the effective nuclear charge increases and the atomic radius decreases. So the protons hold the electrons more tightly thus the loss of electrons become difficult.
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