Chemistry
Grade-9
Easy
Question
If an element has an atomic number of 23 and an atomic mass of 50.89, how many neutrons must it have in its nucleus?
- 38
- 28
- 17
- 29
Hint:
Atomic mass = number of proton + number of neutron
The correct answer is: 28
- Atomic number =number of protons.
- Atomic mass = number of proton + number of neutron.
- Atomic number is 23, atomic mass is 50.89.
number of neutron = 28.
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