Question

A particular atom becomes more energetic stable when it loses a single electron. It is most likely an atom of which of the following elements? A(fluorine) B(magnesium) C(boron) D(cesium)

Answer 1

Atoms which lose a single electron are cations with charge of +1. (has one valence electron)
(group 1 element) Fluorine is a group 17 element, Magnesium is a group 2 element, Boron is a group 13 element, and cesium is a group 1 element.
Answer: cesium :)