Constituents of the atom and isotopes Quiz
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5 questions, one answer each
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1. How many neutrons are in a nucleus?
- A. 92
- B. 143
- C. 235
- D. 327
2. How many electrons are in a magnesium ion Mg²⁺ (proton number 12)?
- A. 14
- B. 12
- C. 10
- D. 24
3. A helium-4 nucleus has charge 3.20×10⁻¹⁹ C and mass 6.64×10⁻²⁷ kg. What is its specific charge?
- A. 4.8×10⁷ C kg⁻¹
- B. 9.6×10⁷ C kg⁻¹
- C. 2.1×10⁻⁸ C kg⁻¹
- D. 1.7×10¹¹ C kg⁻¹
4. Which of these particles has the largest specific charge?
- A. Proton
- B. Neutron
- C. Alpha particle
- D. Electron
5. Which statement about isotopes of an element is correct?
- A. They have different numbers of protons
- B. They have different numbers of electrons in neutral atoms
- C. They have the same number of protons but different numbers of neutrons
- D. They have the same nucleon number