Question

Can u explain order of electronegativity got 15th grp

Answer 1

The order of electronegativity for Group 15 elements is:

N > P > As > Sb > Bi

Answer 2

Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself in a chemical bond.

Trend of Electronegativity in a Group:

As we move down a group in the periodic table, the electronegativity generally decreases. This is due to two main reasons:

1. Increase in Atomic Size: As we move down a group, the number of electron shells increases, leading to an increase in the atomic radius.
2. Increase in Shielding Effect: The added inner electron shells shield the valence electrons from the nucleus more effectively.

These factors result in a weaker attraction of the nucleus for the valence electrons (and thus for a shared pair of electrons), leading to a decrease in electronegativity.

Electronegativity Order for Group 15 Elements:

Group 15 consists of Nitrogen (N), Phosphorus (P), Arsenic (As), Antimony (Sb), and Bismuth (Bi). Following the general trend, the electronegativity decreases as we move down the group:

Nitrogen (N) > Phosphorus (P) > Arsenic (As) > Antimony (Sb) > Bismuth (Bi)

Electronegativity Values (Pauling Scale):

• Nitrogen (N): 3.04
• Phosphorus (P): 2.19
• Arsenic (As): 2.18
• Antimony (Sb): 2.05
• Bismuth (Bi): 2.02

The values confirm the decreasing trend. Note the very slight difference between P and As.

Electronegativity decreases down a group due to increasing atomic size and shielding effect, which reduces the nuclear attraction for bonding electrons. For Group 15, this means the order of electronegativity is N > P > As > Sb > Bi.