Question

What is mean of negative electron density curve?

Answer 1

hello friend here is your answer.
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Electron density is the measure of the probability of an electron being present at a specific location.

In molecules, regions of electron density are usually found around the atom, and its bonds. In de-localized or conjugated systems, such as phenol, benzene and compounds such as hemoglobin and chlorophyll, the electron density covers an entire region, .
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Answer 2

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An atom or group with lower electron density means that some aspect of molecular structure is shifting negative charge away. ... These effects can be seen by comparing the color around each oxygen atom in the electrostatic potential maps.