Chemistry

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Across
  1. 4. /is a fast process of burning something
  2. 7. /are atoms which have the same atomic number and different atomic mass
Down
  1. 1. /electronic orbits are the paths followed by electrons around the nucleus of the atom
  2. 2. /is a chemical reaction in which a substance combines with oxygen
  3. 3. /the elements found in Group 8 of the Periodic Table
  4. 5. /the center of an atom formed from protons and neutrons
  5. 6. /a very small particle of an element