Multiple Choice
How many neutrons does the isotope nitrogen-15 have?
2. Atoms & Elements
Isotopes
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How many neutrons are in a typical atom of sodium (Na) with an atomic number of 11 and an atomic mass of 23?
A
13
B
11
C
23
D
12
Verified step by step guidance1
Identify the atomic number of sodium (Na), which is 11. This number represents the number of protons in the nucleus of a sodium atom.
Identify the atomic mass of sodium, which is given as 23. This value is the sum of the protons and neutrons in the nucleus.
To find the number of neutrons, use the formula: Number of Neutrons = Atomic Mass - Atomic Number.
Substitute the known values into the formula: Number of Neutrons = 23 (atomic mass) - 11 (atomic number).
Perform the subtraction to find the number of neutrons in a typical sodium atom.
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