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masya89 [10]
3 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]3 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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<h3>n = 4 g / 2g. mol⁻¹</h3><h3>n = 2 mol</h3><h3>T =25⁰ + 273 ⁰K = 298 ⁰K</h3><h3>V = (2 mol ₓ0.082 L. atm / mol.°K x 298 ⁰K) / 1.18 atm = 41.46 L</h3>
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