2
QuizMultiple Choice

Heredity and Heritability — Unit test

Question 2 • Anatomy & Physiology A

Hydrogen and oxygen are two of the main elements found in the human body. Hydrogen has an atomic number of 1, and oxygen has an atomic number of 8. Therefore, it can be concluded that

Answer
A
there is more hydrogen than oxygen in the human body.
B
oxygen has more isotopes than hydrogen.
C
an oxygen atom has more protons than a hydrogen atom.
D
hydrogen always has more electrons than oxygen.

Explanation

An element’s atomic number equals the number of protons in each atom. Oxygen’s atomic number is 8, so an oxygen atom has 8 protons; hydrogen’s atomic number is 1, so a hydrogen atom has 1 proton. Therefore, oxygen has more protons than hydrogen. Atomic numbers alone do not tell us how much of each element is in the body or how many isotopes each has.

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