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ATOMIC STRUCTURE MCQs

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1. Atom consist of ----------- particles:





2. The smallest particle of an element which takes part in chemical reaction is:





3. Fourth state of matter is:





4. The mass of proton is ----------- times heavier than that of electron:





5. Mass number is sum of the masses of:





6. Charge on electron (in Coulomb) is:





7. Charge on proton (in Coulomb) is:





8. Mass of electron (in Kg) is:





9. Mass of proton (in Kg) is:





10. Electron was discovered by:





11. Electron revolves around:





12. Proton was discovered by:





13. Percentage of carbon in wrought iron is:





14. H⁺ ion is also called:





15. Which of the following is most penetrating particle of an atom:





16. Gold foil used in Rutherford experiment had thickness (cm) of:





17. Shape of S orbital is:





18. According to Bohr, which shell has lowest energy:





19. Atomic mass is represented as:





20. Value of Planck’s constant is:





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