If you think to prepare chemistry then Atomic Structure is the almost first chapter to prepare. That’s why we discuss most important MCQ On Atomic Structure Questions Answer.

MCQ On Atomic Structure Questions Answer

MCQ On Atomic Structure Questions Answer.
MCQ On Atomic Structure Questions Answer

1. When Dalton’s Atomic Theory published ?
Ans. In the year 1808.

2. “Atoms are neither be created nor destroyed in chemical reaction” – Who said ?
Ans. The greatest scientist John Dalton in Dalton Theory.

3. Based on which theory we known that matter consists of indivisible atoms at first ?
Ans. Dalton’s Theory in the year 1808.

4. Which particles are called fundamental particles in atomic structure ?
Ans. Electron, Proton and Neutron.

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5. Who was discover Electron ?
Ans. J J Thomson in 1897.

6. From which rays electron was discovered ?
Ans. Cathode Rays.

7. Television Picture Tube are made of which ray tube ?
Ans. Cathode Ray Tube.

8. The charge of on electron is ?
Ans. -1.602 × 10ˆ-19 C.

9. Actual mass of Electron is ?
Ans. 9.11 × 10ˆ-13 kg (The mass of electron is consider to negligible).

10. Which is the most lightest particle ?
Ans. Electron.

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11. The Specific Charge or e/m ratio of an electron is ?
Ans. 1.76 × 10ˆ8 C/g .

12. e/m ratio does not depends upon –
Ans. Nature gas and electrode.

DiscoveredJ J Thomson
Charge-1.602 × 10ˆ-19 C
Mass9.11 × 10ˆ-13 kg
Specific Charge or e/m ratio1.76 × 10ˆ8 C/g



13. Who was discovered Protons ?
Ans. E Goldstein in 1886.

14. From which rays protons was discovered ?
Ans. Canal Rays.

15. Proton’s name was given by which scientist ?
Ans. Rutherford.

16. The charge of a proton is ?
Ans. + 1.6 × 10ˆ-19 C.

17. The mass of a proton is ?
Ans. 1.67 × 10ˆ-27 kg.

Proton Amount/Name
DiscoveredE Goldstein
Charge+ 1.6 × 10ˆ-19 C
Mass1.67 × 10ˆ-27 kg



18. Who was discovered Neutrons ?
Ans. Chadwick in 1932.

19. The charge of a neutron is ?
Ans. It has no charge. Neutrons are electrically neutral.

20. The mass of a Neutron is ?
Ans. 1.67 × 10ˆ-27 kg (approximately equal to proton).

ChargeNo Charge
Mass1.67 × 10ˆ-27 kg

21. Who was discovered positron (e†) ?
Ans. Anderson in 1932.

22. A positron has-
Ans. Positive charge and and its mass equal to electron.

23. Antiproton is
Ans. The antiparticle of proton. Its charge is -e and its mass is equal to the proton mass.

24. In which element does not possess any neutrons ?
Ans. Hydrogen or Protium.

25. Who is consider as the Originator of Modern Atomic Theory ?
Ans. John Dalton.

26. Which atoms are non-reactive atoms ?
Ans. Nobel gas atoms.

27. Which is the smallest atom ?
Ans. Helium atom (radius 32 × 10ˆ-12 m).

28. Which is the largest atom ?
Ans. Cesium (Cs) atom (radius 225 × 10ˆ-12 m).

29. Neutrino and Antineutrino has-
Ans. Energy and Momentum but they have not rest mass and charge.

30. Bason =
Ans. Bason = Meson + Photon.

31. Who proposed that in atom, the negative and positive charges are equal in magnitude ?
Ans. The great scientist Thomson in his “Thomson Model”.

32. From which model we know that neutron placed in the center of an atom ?
Ans. Rutherford Atomic Model in 1911.

33. From which model we know that electrons revolve around the nucleus in well defined orbits of an atom ?
Ans. Rutherford Atomic Model in 1911.

34. What is Atomic number(Z) ?
Ans. Proton number in a atom is called atomic number which is equal to the electron number.

35. What is “Mass Number” of atom ?
Ans. Total number of Proton and Neutron (P+N).

36. What is called Nucleons ?
Ans. Protons and Neutrons are collectively called Nucleons.

37. What is Isotopes of an elements ?
Ans. Having same number of protons or electrons but differ in number of neutrons.

38. Whose isotopes is Deuterium ?
Ans. Hydrogen . Another isotopes of hydrogen is Protium and Tritium/Radioactive.

39. Which elements has maximum number of isotopes ?
Ans. Polonium has.

40. What is Isobars of an elements ?
Ans. Having same mass number but different atomic number.

41. What is Isotones of an elements ?
Ans. Having same neutrons number but different mass of atomic number.

42. What is Isodiaphers of an elements ?
Ans. Chemically different but have similar difference between their number of protons and neutrons.

43. Number of valence electron of Potassium (K) is ?
Ans. 1 (electron distributions 2,8,8,1).


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