Atomic Structure Important Questions

7th Standard EM

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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The basic unit of matter is ________

    (a)

    Element

    (b)

    Atom

    (c)

    Molecule

    (d)

    Electron

  2. _______ is positively charged.

    (a)

    Proton

    (b)

    Electron

    (c)

    Molecule

    (d)

    Neutron

  3. _________ Nucleons comprises of

    (a)

    Protons and electrons

    (b)

    Neutrons and electrons

    (c)

    Protons and neutrons

    (d)

    Neutrons and Positron

  4. ____________ is made up of two or more atoms

    (a)

    Atoms

    (b)

    Molecule

    (c)

    Compound

    (d)

    None

  5. Whose theory does not propose anything about the positive and negative charges of an atoms.

    (a)

    J.J. Thomson

    (b)

    Dalton

    (c)

    Rutherford

    (d)

    Bohr

  6. 5 x 1 = 5
  7. The smaller particles found in the atom is called __________.

    ()

    Sub-atomic particles

  8. The _______ revolve around the nucleus.

    ()

    electrons

  9. There are two electrons in the outermost orbit of the magnesium atom. Hence, the valency of magnesium is___________.

    ()

    2

  10. ____________ is the smallest particle of a chemical element.

    ()

    Atom

  11. ____________ compared an atom to a watermelon.

    ()

    J.J. Thomson

  12. 5 x 1 = 5
  13. A neutron is a neutral particle

    (a) True
    (b) False
  14. The outermost orbit of an atom can have more than 8 electrons.

    (a) True
    (b) False
  15. Rutherford used beta particles in his scattering experiments

    (a) True
    (b) False
  16. The combining capacity of an element is called mass number.

    (a) True
    (b) False
  17. Mass number determines the number of atoms of an element that combines with atom or atoms of another type.

    (a) True
    (b) False
  18. 4 x 1 = 4
  19. Valency

  20. (1)

    Neutron

  21. Neutral Particle

  22. (2)

    Monovalent

  23. Hydrogen

  24. (3)

    Electrons in the outermost Orbit

  25. Positively charged Particle

  26. (4)

    Proton

    2 x 2 = 4
  27. Sun: Nucleus, planets: _______.

  28. K: Potassium, C: __________.

  29. 4 x 2 = 8
  30. Define an atom.

  31. What is atomic number?

  32. What is atomic number?

  33. What is an electron?

  34. 3 x 3 = 9
  35. Distinguish Isotopes from Isobar.

  36. Differentiate mass number from atomic number.

  37. Define isotopes? Give example.

  38. 2 x 5 = 10
  39. Draw the atom structure and explain the position of the sub-atomic particles.

  40. What are nucleons. Why are they so called? Write the properties of the nucleons.

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