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 the 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





12. . Modern periodic law is based on





13. . The valency of all the 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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