science
Grade-9
Easy
Question
How many numbers of neutrons does phosphorous element has, if its mass number is 31?
- 16
- 15
- 17
- 31
Hint:
The number of neutrons in phosphorous 31 is 16.
The correct answer is: 16
- The mass number of phosphorous is 31, including the number of protons and neutrons.
- The number of protons in phosphorous 31 is 15.
- To obtain the number of neutrons, the number of protons can be subtracted from the mass number.
- Thus the number of neutrons is 16 in phosphorous 31.
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