science
Grade-9
Easy
Question
What is the mass number of an element which has 15 protons and 16 neutrons?
- 15
- 16
- 31
- 30
Hint:
The mass number of an atom that has 15 electrons and 16 neutrons is 31.
The correct answer is: 31
- The mass number or mass atomic number is the total of protons and neutrons in the nucleus of an atom.
- If the atom has 15 protons and 16 neutrons the atomic number would be the sum of both.
- So the mass number of the atom is 31 (15+16=31).
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