객관식
Which of the following particles are found in the nucleus of an atom?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in a neutral atom of calcium?
A
18
B
20
C
40
D
12
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검증된 단계별 안내1
Recall that the number of protons in a neutral atom is equal to the atomic number of the element.
Identify the element given in the problem, which is calcium.
Look up the atomic number of calcium on the periodic table; this number represents the number of protons.
Understand that the atomic number of calcium is 20, meaning a neutral calcium atom has 20 protons.
Confirm that the number of protons equals the number of electrons in a neutral atom, but the question only asks for protons.
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