Multiple Choice
How many neutrons are in a typical atom of sodium (Na) with an atomic number of 11 and an atomic mass of 23?
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2. Atoms & Elements
Isotopes
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How many neutrons are in an atom of carbon-12?
A
4
B
8
C
6
D
12
Verified step by step guidance1
Identify the atomic number of carbon, which is 6. This number represents the number of protons in the nucleus of a carbon atom.
Understand that the mass number of an isotope, such as carbon-12, is the sum of protons and neutrons in the nucleus.
Use the formula: \( \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \).
Substitute the known values into the formula: \( \text{Number of neutrons} = 12 - 6 \).
Calculate the result to find the number of neutrons in an atom of carbon-12.
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