객관식
How many neutrons does a typical sodium (Na) atom have, given that its atomic number is 11 and its most common isotope has a mass number of 23?
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객관식
How many neutrons are in an atom of lithium with an atomic mass of 7?
A
5
B
4
C
6
D
3
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검증된 단계별 안내1
Identify the atomic number of lithium, which is 3. This represents the number of protons in the atom.
Understand that the atomic mass given is 7. This is the sum of protons and neutrons in the atom.
Use the formula: \( \text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number} \).
Substitute the known values into the formula: \( \text{Number of neutrons} = 7 - 3 \).
Calculate the result to find the number of neutrons in the lithium atom.
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