Which term best describes c2o4 2− ? polyatomic anion polyatomic cation monatomic anion monatomic cation

Polyatomic anion

Explanation:

Polyatomic anion:

The polyatomic anion is substance having more than one atoms and carrying negative charge.

The poly is Greek word meaning "many". The given compound C₂O²⁻₄

is polyatomic anion because it is made up of more than one atom and have negative charge. The atoms in this compound act as a single unit. In this compound two carbon atoms combine with four oxygen atoms and oxygen carry -2 charge.

In contrast to polyatomic anion, polyatomic cations are also exist. In polyatomic cations positive charge is present in compound and it is also made up of more than one atoms.

Non-polar compounds: , ,

Polar compounds: ,

Explanation:

For this question, we must start with the Lewis structure for each molecule and then we can do their respective analysis:

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In this case, we have 4 equal atoms attached to the central atom. Therefore, we have the same magnitude of electronegativity. Chlorine atoms have different and opposite directions. Therefore due to the orientation the dipole moments cancel and the net dipole moment will be zero and the molecule will be non-polar.

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In this case, we have a linear structure in which the magnitude of the dipole moment is the same, but the direction is the opposite. Therefore the dipole moments are canceled and the molecule will be non-polar.

-)

In this case, we also have a linear structure in which the magnitude of the dipole moment is the same, but the direction is the opposite. Therefore the dipole moments are canceled and the molecule will be non-polar.

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For this molecule, we have a different atom. The hydrogen atom, therefore the magnitude of one of the atoms attached to the central atom is different and the magnitude of the net dipole moment will be different from zero and the molecule will be polar.

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For this molecule, due to the structure of the molecule, the dipole moments of oxygens will not have a totally opposite configuration. Therefore, the net dipole moment will be different from zero and the molecule will be polar.

See figure 1 to further explanations

I hope it helps!