chemistry - 9th grade

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Across
  1. 5. common salt also called as
  2. 6. group of different type of atoms
  3. 8. supporter for combustion
  4. 10. total of protons and neutrons in atom
Down
  1. 1. first element in periodic table
  2. 2. vertical columns in periodic table
  3. 3. solid form of water
  4. 4. place where protons and neutrons are together
  5. 7. point where solid turns into liquid
  6. 9. negatively charged particle in an atom