# 3.5.0.0: Electronegativity and Polarity (Problems)

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PROBLEM $$\PageIndex{1}$$

Predict which of the following compounds are ionic and which are covalent, based on the location of their constituent atoms in the periodic table:

a. Cl2CO
b. MnO
c. NCl3
d. CoBr2
e. K2S
f. CO
g. CaF2
h. HI
i. CaO
j. IBr
k. CO2

covalent

ionic

covalent

ionic

ionic

covalent

ionic

covalent

ionic

covalent

covalent

PROBLEM $$\PageIndex{2}$$

Explain the difference between a nonpolar covalent bond, a polar covalent bond, and an ionic bond.

nonpolar covalent: electronegativity difference is less than 0.4 (nonmetal+nonmetal close together on the periodic table)

polar covalent: electronegativity difference in between 0.4 and 2.0 (nonmetal + nonmental further apart on the periodic table)

ionic: electronegativity difference is above 2.0 (metal + nonmetal)

PROBLEM $$\PageIndex{3}$$

From its position in the periodic table, determine which atom in each pair is more electronegative:

a. Br or Cl
b. N or O
c. S or O
d. P or S
e. Si or N
f. Ba or P
g. N or K

Cl

O

O

S

N

P

N

PROBLEM $$\PageIndex{4}$$

From its position in the periodic table, determine which atom in each pair is more electronegative:

a. N or P
b. N or Ge
c. S or F
d. Cl or S
e. H or C
f. Se or P
g. C or Si

N

N

F

Cl

C

P

C

PROBLEM $$\PageIndex{5}$$

From their positions in the periodic table, arrange the atoms in each of the following series in order of increasing electronegativity:

a. C, F, H, N, O
b. Br, Cl, F, H, I
c. F, H, O, P, S
d. Al, H, Na, O, P
e. Ba, H, N, O, As

H, C, N, O, F

H, I, Br, Cl, F

H, P, S, O, F

Na, Al, H, P, O

Ba, H, As, N, O

PROBLEM $$\PageIndex{6}$$

Which is the most polar bond?

C–C; C–H; N–H; O–H; Se–H

O–H

PROBLEM $$\PageIndex{7}$$

Identify the more polar bond in each of the following pairs of bonds:

a. HF or HCl
b. NO or CO
c. SH or OH
d. PCl or SCl
e. CH or NH
f. SO or PO
g. CN or NN

HF

CO

OH

PCl

NH

PO

CN

PROBLEM $$\PageIndex{8}$$

Which of the following molecules or ions contain polar bonds?

a. O3
b. $$\ce{O2^2-}$$
c. $$\ce{NO3-}$$
d. CO2
e. H2S
f. $$\ce{BH4-}$$
g. S8

c, d, e, f