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?
- Boron
- Carbon
- Nitrogen
- Lithium
Hint:
Atomic mass = number of protons + number of protons.
The correct answer is: Carbon
- Atomic number = number of protons and atomic mass = number of protons + number of protons.
- Atomic number of the element is 23 and an atomic mass of 50.89 which is almost equal to 51.
- Number of neutrons in the element is 28.
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