Lithium atom of electron configuration 2,1 , it will …………. One electron to become stable ion. lose
Gain
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lose

Explanation:

as you have mentioned it has a electronic configuration as 2,1 that means it has one electrone in its last shell which is unstable. in ur mcq it has lose,gain.share

in order to be a stable atom lithium should either give away that one electron or gain 7 electrons. so as to ur question 7 electrons is out of the track so it is lose one electron

hope this helps