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How many more neutrons are present in an isotope of carbon-14 compared to a standard carbon-12 atom?
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2. Atoms & Elements
Isotopes
Multiple Choice
How many protons does the isotope lithium-8 have?
A
8
B
3
C
4
D
5
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검증된 단계별 안내1
Recall that the number of protons in an element is defined by its atomic number, which is unique to each element.
Identify the element in question: lithium. Lithium has an atomic number of 3, meaning it has 3 protons.
Understand that the isotope number (in this case, 8 in lithium-8) represents the sum of protons and neutrons in the nucleus, not the number of protons alone.
Therefore, regardless of the isotope number, the number of protons in lithium remains constant at 3.
Conclude that lithium-8 has 3 protons.
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