Fundamental particles, mass number and isotopes Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. Which particle has relative charge 0 and relative mass 1?
- A. Electron
- B. Proton
- C. Neutron
- D. Positron
2. How many neutrons are in a ³⁷Cl⁻ ion (atomic number 17)?
- A. 20
- B. 17
- C. 18
- D. 37
3. How many electrons are in a ²⁷Al³⁺ ion (atomic number 13)?
- A. 13
- B. 16
- C. 27
- D. 10
4. Why do ³⁵Cl and ³⁷Cl have the same chemical properties?
- A. They have the same number of neutrons
- B. They have the same number of electrons, so the same electron arrangement
- C. They have the same mass number
- D. They have different numbers of protons
5. In the alpha scattering experiment, a very small number of alpha particles rebounded. What does this show?
- A. Electrons are positively charged
- B. Atoms are solid spheres
- C. Most of the mass and the positive charge are in a tiny nucleus
- D. Atoms contain no empty space