7th Grade 1st Term Final

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Across
  1. 1. a column in the periodic table
  2. 5. the number of particles in an area; mass per unit volume
  3. 8. subatomic particle with positive charge
  4. 9. how much matter a substance contains
  5. 11. a minute portion, piece, fragment or amount
  6. 12. quantum/cloud model
  7. 15. a miniature representation
  8. 17. a measure of warmth or coldness
  9. 19. state of matter with fast molecular motion
  10. 20. subatomic particle with no charge
  11. 21. state of matter with moderate molecular motion
Down
  1. 2. type of measuring system
  2. 3. the amount of space a substance occupies
  3. 4. smallest part of an element with the properties of that element
  4. 5. type of variable we measure
  5. 6. type of variable we control/manipulate
  6. 7. what all substances are made of
  7. 10. developed idea of the atom
  8. 11. member of nitrogen family with 16 neutrons
  9. 13. subatomic particle with negative charge
  10. 14. state of matter with slow molecular motion
  11. 16. 78% of the atomosphere/air
  12. 18. the smallest physical unit of an element