- In each of the following sets of elements, which element shows the least ability to gain or lose
electrons?
a. Cs, Rb, Na
b. Ba, Ca, Be
c. F, Cl, Br
d. O, Te, S

a. Cs, Rb, Na

Explanation:

Electronegativity is the ability of an element to lose or gain electrons. It is expressed as a number that measures the relative tendency with which atoms of the element attract valence electrons in a chemical bond.

Across the periodic table, electronegativity increases except for the noble gasesIt decreases down the groupGroup 1 elements have the least electronegativityCs, Rb and Na all belongs to this groupThey are called the alkali metalsThey are the most electropositive group on the periodic table.

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