Question

The pair of elements that forms the LEAST polar bond is
a.
Na and Cl
c.
S and Cl
b.
N and Cl
d.
Si and Cl

The answer is B, can anyone explain why? Thanks.

Answer 1

I thought it would be A seeing how NaCl form an ionic bond...

Answer 2

Wait the choices run a,c,b,d.

Which one is b?

Answer 3

N and Cl.
Sorry, the answer choices are messed up.

Answer 4

Na + Cl is going to be VERY polar since the electron will become essentially part of the C.
S + Cl will share the electrons slightly unevenly as Cl "wants" the electron more than S.
Since N + Cl have different numbers of electrons to acquire, the electrons will gravitate more towards Cl since it is more massive in size comparison and needs only one electron (thus the Z effect or effect of the nucleus will become stronger and pull the electrons closer to Cl).

Answer 5

Does this have to do with the different charges?

Answer 6

deferance in electronegativity more likely

Answer 7

Okay. Thanks.