Atomic Structure MCQs

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1. The word atom is derived from a Greek word





2. The mass of electron is ______ times the mass of proton





3. All the particles present in the nucleus are called





4. The proton was discovered by





5. The atomic number is represented by





6. The region around the nucleus where probability of finding electrons is maximum is called





7. The maximum number of electrons in ā€˜sā€™ orbital is





8. The groups present in the periodic table are





9. The periods in the periodic table are





10. The vertical columns in periodic table are called





11. The horizontal rows in periodic table are called





12. Modern periodic law is based on





13. The valency of all elements present in same group is





14. The blocks in the periodic table are





15. Atomic size in a group from top to bottom





16. Until now ______ elements have been discovered





17. The smallest particle of an element that takes part in chemical reaction is





18. The mass of a neutron is ______ kg





19. The atoms of the same element having same atomic number but different mass number are called





20. The maximum number of electrons in an orbit is given by formula





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