1. Who discovered the neutron?, A) J.J. Thomson, B) Ernest Rutherford, C) James Chadwick, D) Niels Bohr, 2. In Bohr’s model, electrons move in what type of path, A) Random paths, B) Fixed circular orbits, C) Inside nucleus, D) Straight lines, 3. The nucleus of an atom contains which particles?, A) Only electrons, B) Protons and electrons, C) Protons and neutrons, D) Only neutrons, 4. Neutrons carry what charge?, A) Positive, B) Negative, C) No charge, D) Double positive, 5. Electrons are found in which part of the atom?, A) Nucleus, B) Orbits/shells, C) Inside protons, D) Neutrons, 6. Maximum number of electrons in a shell is given by which formula?, A) n², B) 2n, C) 2n², D) n³, 7. Maximum electrons in K shell?, A) 8 electrons, B) 2 electrons, C) 18 electrons, D) 32 electrons, 8. Maximum electrons in L shell?, A) 2 electrons, B) 8 electrons, C) 18 electrons, D) 32 electrons, 9. Maximum electrons in M shell?, A) 2 electrons, B) 8 electrons, C) 18 electrons, D) 20 electrons, 10. What is the outermost shell called?, A) Inner shell, B) Nucleus, C) Valence shell, D) Proton shell, 11. Which part of the atom contains most of its mass?, A) Electrons, B) Nucleus, C) Shells, D) Energy levels, 12. Why don’t electrons fall into the nucleus?, A) They are too heavy, B) They lose energy, C) They exist in fixed energy levels, D) They are inside protons, 13. What is the arrangement of electrons in different shells called?, A) Atomic number, B) Mass number, C) Electronic configuration, D) Valency, 14. What is the role of neutrons?, A) Producing light, B) Making atom unstable, C) Stability of nucleus, D) Forming electrons, 15. How are neutrons calculated?, A) Atomic number + Mass number, B) Mass number – Atomic number, C) Atomic number × Mass number, D) Mass number ÷ 2.

Electrons

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