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How many neutrons are in the nucleus of a potassium atom with a mass number of 39?
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2. Atoms & Elements
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Multiple Choice
An atom's mass number is 13 and its atomic number is 6. How many neutrons are in its nucleus?
A
6
B
19
C
7
D
13
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검증된 단계별 안내1
Identify the given values: the mass number (A) is 13 and the atomic number (Z) is 6.
Recall that the atomic number (Z) represents the number of protons in the nucleus of an atom.
Understand that the mass number (A) is the sum of protons and neutrons in the nucleus.
Use the formula to find the number of neutrons: Neutrons = Mass Number - Atomic Number.
Substitute the given values into the formula: Neutrons = 13 - 6.
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