No.

Speaking in physical terms, even quantum mechanical physical terms, an electron density of zero means that an electron would never, ever be at such a location (zero probability). A negative value would have no meaning.

Speaking mathematically, this result derives from electron density for a single electron being the square of a value and even a negative number, when squared, will be positive.

Why were you asking?

Hello,

Thanks for your answer..

I'm talking about this.

What your diagram is showing is that in a carbon dioxide molecule the carbon nucleus is electrophilic. Because of the orbital configurations, the electron density around the carbon nucleus is low, relative to the 6 protons in the carbon nucleus, but the density is not negative (nor even zero). The greedy oxygen nuclei keep the electrons hanging out closer to them (conceptually). This is all a product of the molecule's orbital configurations.

Thank you. I get it. Maybe my first question was wrong ...

Could Carbon be negative?

Now that is a different question. I think the best answer would still be no.

Check out this link: http://butane.chem.uiuc.edu/pshapley/genchem2/B3/1.html

Those oxygen atoms are hungry for electrons and carbon is such an important element because of the nature of its covalent bonding.

As the link shows towards the bottom, the carbon atoms want to form covalent bonds and the oxygens gobble up the electrons.

Thank you very much for the information.