Grade 7 science crossword

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Across
  1. 3. Is a group of two or more atoms held together by attractive forces known as chemical bonds
  2. 5. Is a silvery-grey metal in the actinide series of the periodic table
  3. 9. Has a atomic mass:195.08 u
  4. 10. Is named after a planet
  5. 13. Is the bases of all matter
  6. 14. A chemical substance that cannot be broken down into other substances
  7. 16. Is a substance that dissolves the other substance
  8. 17. Is named after the creator of the Theory of Relativity
  9. 18. Is a element that whose boiling point is 1586.85°C
  10. 21. Is a mixture with a non-uniform composition
Down
  1. 1. Is the product of a Solute and a Solvent
  2. 2. Is the rarest naturally occurring element
  3. 4. A substance made from two or more different elements that have been chemically joined
  4. 6. Is a mixture with a uniform composition
  5. 7. All of its particles at a medium distance away from each other, fill their container, and move the second fastest out of all states of matter
  6. 8. All of its particles are far apart, fill their container, and move the fastest out of all states of matter
  7. 9. Substance that is made up of only one kind of particle and have a fixed or constant structure
  8. 11. Is nutrient commonly found in bananas
  9. 12. is a substance that is being dissolved
  10. 15. Is the last element in the periodic table
  11. 19. Is a matter except composed of antiparticles
  12. 20. All of its particles are close, the particles are ridged and maintain their structure, and are the slowest out of all states of matter