Directions: In the questions given below, four options have been given. Click on the option which you think is the RIGHT ANSWER to the question.
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1. Which of the following defines the Mass number of an atom? |
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2. Who is credited with the discovery of electron? |
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3. An atom has a mass number of 37 and atomic number 17. How many protons does it have? |
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4. Which of the following mostly accounts for the mass of an atom? |
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5. Within an atom, the nucleus when compared to the extra nuclear part is - |
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6. What would be the atomic number of the element in whose atom the K and L shells are full? |
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7. Which metal was used by Rutherford in his alpha-scattering experiment? |
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8. An element has an electronic configuration of 2, 8, 7. Its valency is |
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9. During a chemical reaction, atomic number |
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10. Which isotope of hydrogen contains only one proton and no neutron in its nucleus? |
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11. Who of the following was awarded the Nobel Prize for his measurement of elementary electronic charge? |
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12. How are the subshells in an atom labelled? |
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13. The isotopes of neutral atoms of an element differ in |
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14. The electronic configuration of an atom having atomic number 20 is | |
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15. Almost the entire mass of an atom is concentrated in the | |
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16. An atom differs from its ion in - | |
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17. The proton is heavier than an electron by - | |
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18. Which of the following is true about a charged atom? | |
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19. Which of the following is not a fundamental particle? | |
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20. Which one among the following most correctly determines the atomic number of an element? | |
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21. Which of the following is the correct electronic configuration of Nickel with an atomic number 28? | |
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22. How many electrons does the outermost shell of neon have? | |
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23. Which of the following determines the chemical properties of an element? | |
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24. The number of protons in a negatively charged atom (anion) is - | |
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25. Atoms which have same mass number but different atomic number are called - | |
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26. The atomic theory of matter was first proposed by | |