Isotopes and IsobarsPractice Questions & MCQs
Practice Isotopes and Isobars 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.
Isotopes and IsobarsQuiz - Solve & Score
Q1. A laboratory vial is labelled as the isotope hydrogen-1; how many neutrons are packed inside one such nucleus?
- A.2
- B.0
- C.3
- D.1
Answer: B. 0
hydrogen has atomic number Z = 1, so every hydrogen atom has 1 protons. The tag hydrogen-1 sets the mass number A = 1. Neutrons = A - Z = 1 - 1 = 0.
Q2. The periodic-table poster in a classroom shows an entry written carbon-12; what number of neutrons does this atom hold?
- A.18
- B.12
- C.13
- D.6
Answer: D. 6
carbon has atomic number Z = 6, so every carbon atom has 6 protons. The tag carbon-12 sets the mass number A = 12. Neutrons = A - Z = 12 - 6 = 6.
Q3. A museum card describes a single atom of oxygen-16; how many uncharged particles lie in its core?
- A.17
- B.8
- C.24
- D.16
Answer: B. 8
oxygen has atomic number Z = 8, so every oxygen atom has 8 protons. The tag oxygen-16 sets the mass number A = 16. Neutrons = A - Z = 16 - 8 = 8.
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