Question

8 (iv) Identify the reason for the gradual change in electronegativity in halogens down the group.

a) Electronegativity increases down the group due to decrease in atomic size

b) Electronegativity decreases down the group due to decrease in tendency to lose electrons

c) Electronegativity decreases down the group due to increase in atomic radius/ tendency to gain

electron decreases

d) Electronegativity increases down the group due to increase in forces of attractions between nucleus

& valence electrons​

Answer 1

Answer:

Electronegativity is a measure of the attraction of an atom for the electrons in a chemical bond. The higher the electronegativity of an atom, the greater its attraction for bonding electrons. Electronegativity is related to ionization energy. Electrons with low ionization energies have low electronegativities because their nuclei do not exert a strong attractive force on electrons. Elements with high ionization energies have high electronegativities due to the strong pull exerted on electrons by the nucleus. In a group, the electronegativity decreases as atomic number increases, as a result of increased distance between thevalence electron and nucleus (greater atomic radius).