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Asked by Jagadeesh Last Modified
Answer 
Sonali Gupta
As sodium has 1 electron in its valace shell so can easily lose it to complete his octet while Mag. Has 2 valance electron so 1st ionization enthalpy of sodium is lower than mag. . While for 2nd sodium have to lose electron from his complete octet so needed more energy while mag lose easily his 2nd electron to complete octet hence 2nd ionization enthalpy of sodium is higher than mag
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