To have a negative ion, you must have: A. added a positron to the outer electron shell. B. taken away a proton from the nucleus. C. added an electron to the outer electron shell. D. added a positron to the nucleus. E. None of these; only positive ions can exist in nature.

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skyluke89 skyluke89 · Answer 1 · 2020-02-09T17:42:14+01:00

C. added an electron to the outer electron shell.

Explanation:

Atoms consist of three particles:

- Protons: they are located in the nucleus, they have positive charge of [tex]+e[/tex], and mass of [tex]1.67\cdot 10^{-27}kg[/tex]

- Neutrons: they are also located in the nucleus, they have no electric charge, and mass similar to that of the proton

- Electrons: they orbit around the nucleus, they have negative charge of [tex]-e[/tex], and mass around 1800 smaller than the proton

Normally, atoms are neutral (no electric charge), because they have an equal number of protons and electrons.

However, sometimes atoms can give off or take electrons from other atoms. We have two cases:

If an atom gives off an electron, it remains with an excess of positive charge, so it becomes a positive ion
If an atom takes an electron from another atom, it remains with an excess of negative charge, so it becomes a negative ion

Therefore, in order to form a negative ion, the atom must have

C. added an electron to the outer electron shell

Learn more about atoms:

brainly.com/question/2757829

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