Class 9 Chapter 4

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Across
  1. 1. Combining capacity of an atom termed as
  2. 5. Who discovered neutron
  3. 6. Sub-atomic particle which does not radiate energy while revolving in discrete orbits
  4. 10. First person to propose model for the structure of an atom
  5. 13. Defined by the number of protons in one atom.
  6. 14. Same atomic number but different mass numbers
  7. 15. Which model of an atom was more successful.
  8. 16. Different atomic numbers but same mass numbers
Down
  1. 2. Negatively charged sub-atomic particle in atom
  2. 3. Either protons or neutrons are also termed as
  3. 4. Positively charged sub-atomic particle in atom
  4. 7. Father of Nuclear Physics
  5. 8. Center of an atom
  6. 9. Element does not contain neutrons.
  7. 11. Sub-atomic particle in atom which do not have any charge.
  8. 12. Electrons in an atom are arranged in.