객관식
An atom of calcium contains 20 protons. How many electrons does it have in its neutral state?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in an atom of oxygen?
A
16
B
6
C
12
D
8
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검증된 단계별 안내1
Identify the element in question, which is oxygen in this case.
Recall that the number of protons in an atom is equal to the atomic number of the element.
Look up the atomic number of oxygen on the periodic table, which is 8.
Understand that the atomic number (8) represents the number of protons in the nucleus of an oxygen atom.
Conclude that an oxygen atom contains 8 protons.
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