Multiple Choice
Which of the following isotopes has the same number of neutrons as phosphorus-31?
2. Atoms & Elements
Isotopes
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The atomic number of nitrogen is 7. What is the mass number of a nitrogen atom with 6 neutrons?
A
11
B
14
C
12
D
13
Verified step by step guidance1
Understand that the atomic number of an element represents the number of protons in its nucleus. For nitrogen, the atomic number is 7, which means it has 7 protons.
The mass number of an atom is the sum of the number of protons and neutrons in its nucleus. This can be expressed as:
Substitute the known values into the equation. The number of protons is 7, and the number of neutrons is given as 6.
Calculate the mass number by adding the number of protons and neutrons:
The result of this addition gives you the mass number of the nitrogen atom with 6 neutrons.
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