The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is canceled by the symmetric tetrahedral shape. When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar. Use as shown to rank the following molecules from the least polar to the most polar: CH2Br2, CF2Cl2, CH2F2, CH2Cl2, CBr4, CF2Br2. 1A2A3B4B(1)(2)(3)5B6878(4)(5) (6)8B1828 3A(9) (10)' (11) (12) (13) (14) (15) (16) (17)4.0(7)(8)445A6A TA3.02.0F4.02.1.02,13,53.00.02.5Li1.0Be1.5B2.0CI3.02.5AI1.5Si1.82.1Na0.9Mg1.2Se24Br2,8NIAsFe1.8CuCrMn1.6 15Co1,8Rh2.2Sc1.3Ti1.518 1.9 Zn Ga1.61.6CdGe1.8 201.6Ca1.0AgKRu2.2PdMo1.8Sn1.8Te2.12.50.82.2 19InNb1.61.9Zr1.41.9Sr1.0A 1,72A 31.8AuRb0.8Os2.2Pt2.2 2.2At2.21.2IrHgBiPoRe1.9Pb1.9 1.9 2.0TIw1.7TaHf1.3La1.5Ba0.9Cs1.10.76.Ra0.9Ac1.1Fr0.7Er Tm Yb Lu1.21.21.2 1.21.21.2 1.2 1.3Es Fm MdDy HoCe1.1Pr Nd Pm Sm Eu Gd Tb1.11.11.21.2 1.1NoAm Cm Bk1.3CfTh1.3Pa1.5NpPu1.71.3 1.3 1.31.31.31,31.51.31.3Figure 9.19 The Pauling electronegativ-ity (EN) scale. The height of each post isproportional to the EN, which is shownon top. The key has several EN cutoffs. In0.7 - 1.41.5 - 1.92.0 - 2.93.0 - 4.0the main groups, EN increases across anddecreases down. The transition and innertransition elements show little changein EN. Here hydrogen is placed near ele-ments with similar EN values.Periodo.CElectronegativityElectronegativityPeriod

The compounds have to be arranged from most polar to least polar.

Answered: 1A 2A 3B 4B (1) (2) (3) 5B 68 78 (4)…

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The four bonds of carbon tetrachloride (CCl₄) are polar, but the molecule is nonpolar because the bond polarity is canceled by the symmetric tetrahedral shape. When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar. Use as shown to rank the following molecules from the least polar to the most polar: CH₂Br₂, CF₂Cl₂, CH₂F₂, CH₂Cl₂, CBr₄, CF₂Br₂.

1A
2A
3B
4B
(1)
(2)
(3)
5B
68
78
(4)
(5) (6)
8B
18
28 3A
(9) (10)' (11) (12) (13) (14) (15) (16) (17)
4.0
(7)
(8)
44
5A
6A TA
3.0
2.0
F
4.0
2.
1.0
2,1
3,5
3.0
0.0
2.5
Li
1.0
Be
1.5
B
2.0
CI
3.0
2.5
AI
1.5
Si
1.8
2.1
Na
0.9
Mg
1.2
Se
24
Br
2,8
NI
As
Fe
1.8
Cu
Cr
Mn
1.6 15
Co
1,8
Rh
2.2
Sc
1.3
Ti
1.5
18 1.9 Zn Ga
1.6
1.6
Cd
Ge
1.8 20
1.6
Ca
1.0
Ag
K
Ru
2.2
Pd
Mo
1.8
Sn
1.8
Te
2.1
2.5
0.8
2.2 19
In
Nb
1.6
1.9
Zr
1.4
1.9
Sr
1.0
A 1,7
2A 31.8
Au
Rb
0.8
Os
2.2
Pt
2.2 2.2
At
2.2
1.2
Ir
Hg
Bi
Po
Re
1.9
Pb
1.9 1.9 2.0
TI
w
1.7
Ta
Hf
1.3
La
1.5
Ba
0.9
Cs
1.1
0.7
6.
Ra
0.9
Ac
1.1
Fr
0.7
Er Tm Yb Lu
1.21.21.2 1.21.21.2 1.2 1.3
Es Fm Md
Dy Ho
Ce
1.1
Pr Nd Pm Sm Eu Gd Tb
1.1
1.1
1.21.2 1.1
No
Am Cm Bk
1.3
Cf
Th
1.3
Pa
1.5
Np
Pu
1.7
1.3 1.3 1.31.31.31,31.5
1.31.3
Figure 9.19 The Pauling electronegativ-
ity (EN) scale. The height of each post is
proportional to the EN, which is shown
on top. The key has several EN cutoffs. In
0.7 - 1.4
1.5 - 1.9
2.0 - 2.9
3.0 - 4.0
the main groups, EN increases across and
decreases down. The transition and inner
transition elements show little change
in EN. Here hydrogen is placed near ele-
ments with similar EN values.
Period
o.C
Electronegativity
Electronegativity
Period

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