Physical and Chemical Properties, Atoms, and Molecules

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Across
  1. 1. the tiny core or center of an atom made up of protons and neutrons
  2. 5. the smallest unit of matter, made up of protons, neutrons, and electrons
  3. 7. a state of matter where the atoms are most closely packed together
  4. 8. a positively charged particle
  5. 10. a very large and complex molecule, made up of 100 to 1000 atoms
  6. 12. when a solid changes to a liquid
  7. 15. when a gas changes to a liquid
  8. 17. a negatively charged particle
  9. 18. a particle without a charge
  10. 19. a state of matter where the atoms a moving at a medium speed, spread out a bit
  11. 20. the attraction formed between two atoms that form compounds and molecules
Down
  1. 2. when a solid changes directly to a gas without ever becoming liquid
  2. 3. a chemical change where new substances are formed
  3. 4. a state of matter where the atoms are rapidly moving, very spread out
  4. 6. when a liquid changes to a gas
  5. 9. a molecule that contains at least two different elements
  6. 11. the branch of science that deals with the identification of the substances of which matter is composed
  7. 13. when a liquid changes to a solid
  8. 14. a group of atoms chemically bonded together
  9. 16. a specific type of atom