Atoms and Elements

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 4. Hopeful and optimistic; the opposite of negative (8)
  2. 7. A body having finite mass and internal structure but negligible dimensions (plural) (9)
  3. 8. An elementary particle with negative charge (8)
  4. 9. An elementary particle with 0 charge and mass about equal to a proton (plural) (8)
  5. 10. A pleading describing some wrong or offense (plural) (7)
  6. 11. Any of several chemical elements that are usually shiny solids that conduct heat or electricity (plural) (6)
  7. 14. A stable particle with positive charge equal to the negative charge of an electron (plural) (7)

Down

  1. 1. The simplest structural unit of an element or compound (8)
  2. 2. A piece of photographic film showing an image with light and shade or colors reversed (8)
  3. 3. That which has mass and occupies space (6)
  4. 5. A well-substantiated explanation of some aspect of the natural world (6)
  5. 6. An abstract part of something (plural) (8)
  6. 9. Center of an atom or a cell (7)
  7. 12. The smallest component of an element having the chemical properties of the element (4)
  8. 13. A hypothetical description of a complex entity or process (plural) (6)
  9. 14. A line or route along which something travels or moves (4)