10 Multiple Choice Questions on Mass Number
1. What does the mass number of an atom represent?
Number of protons
Number of neutrons
Number of protons and neutrons
Atomic weight
Correct Answer
Wrong Answer
2. If an atom has 8 protons and 9 neutrons, its mass number is:
8
9
16
17
Correct Answer
Wrong Answer
3. Which of the following particles are included in the mass number calculation?
Electrons only
Protons only
Neutrons only
Protons and neutrons
Correct Answer
Wrong Answer
4. Mass number is usually represented by which symbol?
Z
A
X
M
Correct Answer
Wrong Answer
5. Isotopes of an element differ in which of the following?
Number of protons
Number of electrons
Mass number
Atomic number
Correct Answer
Wrong Answer
6. The mass number of carbon-14 is:
6
12
14
16
Correct Answer
Wrong Answer
7. In which type of reaction does mass number play a critical role?
Chemical reaction
Physical reaction
Nuclear reaction
Thermal reaction
Correct Answer
Wrong Answer
8. What is the mass number of an atom with 20 protons and 22 neutrons?
20
22
42
44
Correct Answer
Wrong Answer
9. Which of the following is NOT affected by the mass number?
Atomic identity
Atomic stability
Atomic mass
Elemental symbol
Correct Answer
Wrong Answer
10. Which element is commonly used in radioactive dating due to its isotope’s unique mass number?
Carbon
Oxygen
Hydrogen
Nitrogen
Correct Answer
Wrong Answer
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