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How to make out which of the two elements have a larger size:- Li OR Mg

Dear student, 
Li has an atomic number of 3 having a configuration of 1s​2, 2s1
Mg has an atomic number of 12 having a configuration of 1s2,2s2,2p6,3s2 
As it is clear from the configuration Mg has a larger size compared to Li
 

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Elecronic configuration of Li is 1s2 2s1 and that of Mg is 1s2 2s2 2p6 3s2. Here in Mg as elecroms are accomodated in s as well as p subshell the effect of shielding will be poor in Mg but it will be balanced by the incrased nuclear charge and hence Mg will have greater size as compared to Li HOPE IT HELPS)
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