Question

select the correct answer. which of these groups of elements show the least electronegativity? a. inner - transition elements b. halogens (7a) c. alkali metals (1a) d. transition elements e. alkaline earth metals (2a)

Explanation:

Electronegativity is the ability of an atom to attract electrons in a chemical bond. Alkali metals (Group 1A) have the lowest electronegativity values among the main - group elements. They have one valence electron and a relatively large atomic radius, making it easier for them to lose an electron rather than attract electrons. Halogens (Group 7A) have high electronegativities as they are one electron short of a full outer shell and have a strong pull for electrons. Alkaline earth metals (Group 2A) have higher electronegativities than alkali metals but lower than many other groups. Transition and inner - transition elements have more complex electron configurations but generally do not have the lowest electronegativities compared to alkali metals.

Answer:

C. alkali metals (1A)