Science

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Across
  1. 3. The centre of an atom is called
  2. 5. Positive ions are called
  3. 7. Blue litmus paper turns into which colour under acidic conditions
  4. 9. The only metal that is in liquid form at room temperature
  5. 10. An indivisible and basic unit of matter
  6. 11. the mechanical process to separate solids from the fluids
Down
  1. 1. A strong base that dissolves in water
  2. 2. It is defined as mass divided by volume
  3. 4. Unit of measurement of time
  4. 5. It is the study of matter and the changes it undergoes
  5. 6. NH3
  6. 8. The process through which a substance changes from liquid to solid
  7. 9. Anything that has mass and occupies volume