Atomic Number and Mass Number MCQs
Practice Atomic Number and Mass Number multiple-choice questions from Structure of the Atom (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. A school science museum prints a card for sodium reading Z = 11 and A = 23; how many neutrons sit packed inside one nucleus?
- A.11
- B.34
- C.23
- D.12
Answer: D. 12
Number of neutrons = mass number - atomic number = A - Z = 23 - 11 = 12.
Q2. While moulding a clay model of chlorine (atomic number 17, mass number 35), a learner asks how many neutron beads belong in the core; what is the count?
- A.17
- B.35
- C.18
- D.52
Answer: C. 18
Number of neutrons = mass number - atomic number = A - Z = 35 - 17 = 18.
Q3. A planetarium exhibit lists calcium with 20 protons and a nucleon total of 40; what number of those nucleons are neutrons?
- A.60
- B.21
- C.20
- D.40
Answer: C. 20
Number of neutrons = mass number - atomic number = A - Z = 40 - 20 = 20.
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