Question

how does the tendency to lose electrons change in a group and why?

Answer 1

Tendancy to lose electron increases down the group as size of atom increases it columbic force on electron present in outermost shell decreases it can be easily move out from atom.
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Answer 2

The tendency to lose electrons increases down the group.

The effective nuclear charge affecting the valence electrons decreases down the group thus increasing the electronegativity of element down the group

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