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How many neutrons does a lithium atom with a mass number of 7 have?
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2. Atoms & Elements
Isotopes
Multiple Choice
How many neutrons does a sodium (Na) atom typically have?
A
11 neutrons
B
13 neutrons
C
12 neutrons
D
14 neutrons
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검증된 단계별 안내1
Identify the atomic number of sodium (Na) from the periodic table. Sodium has an atomic number of 11, which means it has 11 protons.
Determine the mass number of a typical sodium atom. The most common isotope of sodium is sodium-23, which has a mass number of 23.
Use the formula to find the number of neutrons: \( \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \).
Substitute the values into the formula: \( \text{Number of neutrons} = 23 - 11 \).
Calculate the result from the substitution to find the number of neutrons in a typical sodium atom.
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