Chemistry
Grade-9
Easy
Question
How many neutrons does this isotope of beryllium have?
- 9
- 5
- 4
- 2
Hint:
Atomic mass of Be in the given data is 9 and atomic number is 4.
The correct answer is: 5
- Elements are represented in the form AXZ, A is atomic mass and Z is atomic number.
- Atomic mass = number of proton + number of neutron. Atomic number = number of protons.
- Atomic mass of Be in the given data is 9 and atomic number is 4.
- Therefore, number of neutron in the given isotope is 5.
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