Structure of Atom
Chapter Revision
Structure of Atom Class 9
1.The nucleons are
I. Protons and electrons
II. Neutrons and electrons
III. Protons and neutrons
IV. None of these
2. The isotope deuterium of hydrogen has
I. No neutrons and one proton
II. One neutrons and two protons
III. One electron and two neutron
IV. One proton and one neutron
3. The electrons present in the outermost shell are called
I. Valency electrons
II. Octate electrons
III. Duplet electrons
IV. Valence electrons
4. An alpha particle contains
I. 4 positive charge and 2 mass unit
II. 2 positive charge and 4 mass unit
III. 2 positive charge and 2 mass unit
IV. 4 positive charge and 4 mass unit
5. The atomic number of sodium is 11 and its mass number is 23. It has
I. 11 neutrons and 12 protons
II. 12 protons and 11 electrons
III. 11 electrons and 12 neutrons
IV. 12 electrons and 11 neutrons
6. The electronic configuration of chlorine is
I. 2,7
II. 2,8,8,7
III. 2,8,7
IV. 2,7,8
7. The isotope used to remove the brain tumours and treatment of cancer is
I. U-235
II. Na-24
III. Iodine
IV. C0-60
8. In an alpha scattering experiment, few alpha particles rebounded because
I. Most of the space in the atom is occupied
II. Positive charge of the atoms very little space
III. The mass of the atom is concentrated in the centre
IV. All the positive charge and mass of the atom is concentrated in small volume
9. Within an atom, the nucleus when compared to the extra nuclear part is
I. bigger in volume and heavier in mass
II. smaller in volume but heavier in mass
III. smaller in volume and lighter in mass
IV. same size
10. An atom differs from its ion in
I. Nuclear charge
II. Mass number
III. Number of electrons
IV. Number of neutrons
ANSWERS
1. III
2. IV
3. IV
4. II
5. III
6. III
7. IV
8. II
9. II
10. III
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