객관식
In the simplified atomic model, what is the approximate mass of one neutron?
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4. Atoms and Elements
Subatomic Particles (Simplified)
객관식
How many protons are in an atom of magnesium (Mg)?
A
12
B
10
C
14
D
24
검증된 단계별 안내1
Identify the element in question, which is magnesium (Mg). Each element is defined by its atomic number.
Recall that the atomic number of an element represents the number of protons in the nucleus of an atom of that element.
Look up the atomic number of magnesium on the periodic table. Magnesium has an atomic number of 12.
Therefore, the number of protons in an atom of magnesium is equal to its atomic number, which is 12.
Confirm that the number of protons is not confused with the atomic mass or number of neutrons; only the atomic number gives the proton count.
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