If a bromine atom were to attract an electron from lithium, the lithium atom would become charged.

Lithium atom would become positively charged. Loss of electron will result in more protons than electrons which gives positive charge.

Li - 1 e = Li+

Li atomic number is 3

Electronic configuration : 1s2 2s1

It can easily give away the outer most electron to bromine atom and attain the nearest noble gas configuration i.e. helium which is stable configuration.

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