Structure of atom

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Across
  1. 2. autumns of different elements with the same mass number but the different atomic numbers .
  2. 4. electrons: electrons present in the outermost cell of an atom
  3. 6. neutral: same number of protons and electrons
  4. 7. inert: outermost shell is completely filled
  5. 10. positively
  6. 11. number :it is equal to the sum of protons and a neutrons
Down
  1. 1. :the combining capacity of an atom is called its valency
  2. 3. race :Canal rays are positively charged radiations which led to the discovery of A positively charged subatomic particles called proton
  3. 5. no charge
  4. 6. negatively charched
  5. 8. autumns of same elements with same atomic number but different atomic number
  6. 9. number: it is equal to the number of protons