Class IX

 Two elements X and Y have the same atomic mass but their atomic numbers are 20 and 21 respectively . X and Y are :
  1. Isobars
  2. Isotones
  3. Isomers
  4. Isotopes
The bond which never result i n bond formation is
  1. Ionic
  2. Covalent
  3. Metallic
  4. Dative
Rutherfords scattering experiment is related the size of:
  1. Nucleus
  2. Atoms
  3. Electron
  4. Neutron
The maximum no. of electrons that can be accommodated in M shell are :
  1. 8
  2. 32
  3. 2
  4. 18
Cathode rays have :
  1. Charge only
  2. Mass only
  3. Charge as well as mass
  4. Neither charge nor mass
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