Identify the reason for the gradual change in electronegauvity in halogens
down the group
a) Electronegativity increases down the group due to decrease in atom,
b) Electronegativity decreases down the group due to decrease in
tendency to lose electrons
c) Electronegativity decreases down the group due to merease 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
Answers
Answer:
a) ans- As you move down a group on the periodic table, the electronegativity of an element decreases because the increased number of energy levels puts the outer electrons very far away from the pull of the nucleus. Electronegativity increases as you move from left to right across a period on the periodic table.
b) ans- Moving down in a group, the electronegativity decreases due to an increase in the distance between the nucleus and the valence electron shell, thereby decreasing the attraction, making the atom have less of an attraction for electrons or protons.
d) ans- Electronegativity is the measure of the ability of an atom in a bond to attract electrons to itself. Electronegativity increases across a period and decreases down a group. ... Down a group, the number of energy levels (n) increases, and so does the distance between the nucleus and the outermost orbital.
Answer:
Option D
Explanation:
The number of shells occupied with electrons in the atoms of halogens increases when going down the group. This causes the outermost occupied shell to become further away from the nucleus and is screened by more inner shells containing electrons.