Atomic Number and Mass Number MCQs
Practice Atomic Number and Mass Number multiple-choice questions from Atomic Foundations of Matter (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Atomic Number and Mass NumberQuiz - Solve & Score
Q1. Which quantity stays the same for all isotopes of chlorine?
- A.the atomic number (number of protons)
- B.the mass number
- C.the number of neutrons
- D.the total atomic mass
Answer: A. the atomic number (number of protons)
Q2. Why is the mass number, and not the precise atomic mass, used when writing nuclear symbols?
- A.it is a simple whole-number count of nucleons
- B.it equals the number of electrons
- C.it changes with the atom's charge
- D.it is always larger than the real mass
Answer: A. it is a simple whole-number count of nucleons
Q3. Why do isotopes of an element have the same atomic number but different mass numbers?
- A.they have the same number of protons but different numbers of neutrons
- B.they have different numbers of protons
- C.they have different numbers of electrons
- D.they have no neutrons
Answer: A. they have the same number of protons but different numbers of neutrons
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