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masya89 [10]
2 years ago
9

This atom tends to gain an electron in its outer shell so that there are a total of 8 electrons. - The atoms of this element los

e one electron and become cations. - The atoms of this element all have one proton. - __________ atoms all have 2 protons. A. Sodium B. Chlorine C. Helium D. Hydrogen
Chemistry
1 answer:
bonufazy [111]2 years ago
3 0

Answer:

D.  Helium

Explanation:

By definition, the atomic number of an element is the number of protons in its nucleus.  2 protons mean atomic number 2:  Helium.

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