If an atom has a charge of -2 and an atomic number of 7, how many electrons does it have?

Answer 1

The atom has 9 electrons.

The atomic number for an element is the number of protons in the nuclei of their atoms. In a neutral atom, there are equal numbers of protons and electrons. Since the atom has gained a charge of #"2-"#, it now has two more electrons than protons. So the number of electrons is now #9#.

#"9e"^(-) + 7p^(+) = 2e^-"#

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Answer 2

Ellie Andrews

Nine electrons make up an atom with an atomic number of seven and a charge of -2.

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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.