In the present-day universe there are about 10 hydrogen atoms (¹H) to each helium atom (⁴He). Considering just hydrogen and helium (the vast majority of matter), what is the ratio of neutrons to protons? A)1:10 B)1:6 C)1:4 D)1:1

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Quizplus · Accepted Answer

Hydrogen has one proton and no neutrons, while helium has two protons and usually two neutrons. Therefore, in terms of protons, the ratio is 10:1 (hydrogen to helium), but in terms of neutrons, the ratio is closer to 6:1 (since most helium has two neutrons, while hydrogen has none). Therefore, the best choice is B) 1:6.

In the Present-Day Universe There Are About 10 Hydrogen Atoms