Atomic Number and Mass NumberPractice Questions & MCQs
Practice Atomic Number and Mass Number questions from Structure of the Atom (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then 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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Where can I practise Atomic Number and Mass Number questions for Class 9 Science?
RankByte has Atomic Number and Mass Number practice questions and MCQs from Structure of the Atom (Class 9 Science), each with the correct answer and a step-by-step solution - free to start.
Are these Atomic Number and Mass Number questions important for the exam?
Yes. These Atomic Number and Mass Number important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
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