객관식
Which statement correctly describes the number of protons in each atom of an element?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in an atom of the element cobalt (Co)?
A
27
B
30
C
12
D
59
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검증된 단계별 안내1
Identify the element given in the problem, which is cobalt (Co).
Recall that the number of protons in an atom is equal to the atomic number of the element.
Look up the atomic number of cobalt on the periodic table. The atomic number is usually found above the element symbol.
The atomic number of cobalt corresponds to the number of protons in one atom of cobalt.
Conclude that the number of protons in a cobalt atom is equal to its atomic number.
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