Atomic number, mass number and isotopes Quiz
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5 questions, one answer each
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1. An atom has atomic number 8 and mass number 17. How many neutrons does it have?
- A. 8
- B. 9
- C. 17
- D. 25
2. Which statement about isotopes is correct?
- A. They have different numbers of protons
- B. They have different numbers of electrons
- C. They have the same number of protons but different numbers of neutrons
- D. They have the same mass number
3. A neutral atom has 12 protons and 14 neutrons. How many electrons does it have?
- A. 14
- B. 12
- C. 26
- D. 2
4. A sample of boron is 20% boron-10 and 80% boron-11. What is its relative atomic mass?
- A. 10.0
- B. 10.5
- C. 10.8
- D. 11.0
5. Why do two isotopes of the same element react in the same way?
- A. They have the same mass number
- B. They have the same number of neutrons
- C. They have the same number of electrons
- D. They are in different groups