Year 7 Review

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Across
  1. 2. Specialized structure within a cell
  2. 4. Two or more substances that are not chemically combined
  3. 6. Fourth state of matter, found in stars
  4. 8. Person trained to travel in a spacecraft
  5. 11. Icy body that develops a tail when near the Sun
  6. 13. Letter(s) representing an element
  7. 17. Path of one object around another in space
  8. 21. Building block of all known life
  9. 23. Powerhouse of the cell
  10. 25. Negatively charged particle orbiting the nucleus
  11. 26. Storage sac in a cell
  12. 28. Mixture of a metal with other elements
  13. 30. Natural satellite of a planet
  14. 31. A large celestial body orbiting a star
  15. 32. Plant cell organelle that captures sunlight
  16. 36. State of matter with a fixed shape
  17. 37. Instrument used to observe distant objects in space
  18. 38. The first element on the periodic table
  19. 39. Cloud of gas and dust in space
  20. 41. State of matter that expands to fill its container
  21. 42. Organelle that packages and distributes proteins
  22. 44. Unreactive group of elements on the right side of the periodic table
  23. 47. Rocky object smaller than a planet
  24. 48. Substance made of two or more elements chemically combined
Down
  1. 1. Element essential for breathing
  2. 3. The control center of a cell
  3. 4. Elements that conduct electricity well
  4. 5. Natural or artificial object orbiting a planet
  5. 7. Number of protons in an atom's nucleus
  6. 9. Vehicle that can travel into space
  7. 10. Cell structure where proteins are made
  8. 11. Material that forms chromosomes
  9. 12. Force that attracts objects towards each other
  10. 14. Glowing ball of gas held together by gravity
  11. 15. Describes the table organizing chemical elements
  12. 16. Two or more atoms bonded together
  13. 18. Vertical column in the periodic table
  14. 19. Bowl-shaped depression on a celestial body
  15. 20. Smallest unit of an element
  16. 22. Particle in the nucleus with no electric charge
  17. 24. Pattern of stars in the night sky
  18. 27. Jelly-like substance inside a cell
  19. 29. A vast collection of stars, gas, and dust
  20. 33. Chemical process where substances change into new substances
  21. 34. Barrier surrounding the cell
  22. 35. Horizontal row in the periodic table
  23. 40. Pure substance made of only one type of atom
  24. 43. State of matter that flows and takes the shape of its container
  25. 45. Atoms of the same element with different numbers of neutrons
  26. 46. Positively charged particle in an atom's nucleus