If pyridine and pyrimidine are both aromatic compounds, how many elctrons does each nirtogen atom contribute to the electron cloud of each compound?

Answer 1

In each compound, each #"N"# atom contributes one electron to the π cloud.

Pyridine

The structure of pyridine is

#"N"# has a lone pair and one electron in each of the σ bonds to the carbon atoms on either side.

That leaves 1 valence electron available to participate in the aromatic π cloud.

Pyrimidine

The structure of pyridine is

The two #"N"# atoms are equivalent.

Each #"N"# has a lone pair and one electron in each of the σ bonds to the carbon atoms on either side.

That leaves 1 valence electron available in each #"N"# atom to participate in the aromatic π cloud.

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Answer 2

Each nitrogen atom in pyridine contributes one electron to the electron cloud, while each nitrogen atom in pyrimidine contributes two electrons to the electron cloud.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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