Class IX

Rutherfords scattering experiment is related the size of:
  1. Nucleus
  2. Atoms
  3. Electron
  4. Neutron
In an atom , the mass number of an atom is equal to the number of .
  1. Nucleons
  2. Protons
  3. Electrons
  4. Neutrons
Line spectra are characteristic of:
  1. atoms
  2. molecules
  3. Ions
  4. radicals
The energy levels of hydrogen atom in the ,Bohr model are called:
  1. Orbits
  2. Orbitals
  3. Ground states
  4. None of the above.
Neutrons were discovered by:
  1. James Chadwick
  2. Goldstein
  3. J.J:Thomson
  4. Rutherford
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