Which molecule is Polar
HF
SiBr4
CO2
CH20

Polar molecules have a non-zero net dipole moment. Both CO2 and H2O have two polar bonds. However the dipoles in the linear CO2 molecule cancel each other out, meaning that the CO2 molecule is non-polar. The polar bonds in the bent H2O molecule result in a net dipole moment, so H2O is polar.

Explanation:

it's c. elements are placed in rows based on how may valencies electrons have.

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