객관식
Which element has an atomic number that is exactly double that of silicon?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in an atom of indium (In)?
A
48
B
50
C
47
D
49
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검증된 단계별 안내1
Recall that the number of protons in an atom is equal to its atomic number, which is unique for each element.
Identify the element given in the problem, which is indium (In).
Look up the atomic number of indium on the periodic table. The atomic number corresponds to the number of protons.
Note that the atomic number of indium is 49, meaning an indium atom contains 49 protons.
Therefore, the correct answer is the number that matches the atomic number of indium, which is 49.
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