Hemphill molecules and compounds

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Across
  1. 2. no electrical charge, located inside the nucleus, included in the atom's mass
  2. 5. equal to the number of protons in the nucleus of an atom
  3. 6. using chemical element symbols and numbers to present information about chemical proportions in a compound or molecule
  4. 7. small, dense region at the center of the atom consisting of protons and neutrons
  5. 12. physical material from which something is made
  6. 14. chemical elements organized by atomic number
  7. 15. the most basic form of matter
  8. 16. combination of two or more substances where each substance retains its individual properties.
  9. 18. positively charged, located inside the nucleus, is included in the atom's mass and determines the elements identity
Down
  1. 1. made up of only on type of particle, either one element or a compound and has a fixed composition and properties
  2. 3. small group of atoms held together by chemical bonds
  3. 4. made up of two or more atoms boded together, same or different, and cannot be broken down into smaller particles
  4. 6. a pure substance made up of two or more different chemical elements in a fixed ratio
  5. 8. contain the basic subatomic particles
  6. 9. large three dimesional arrangements of atoms or molecules that repeats in a specific pattern
  7. 10. any substance that cannot be broken into simpler substances by ordinary chemical processes.
  8. 11. force of attraction that holds atoms together to form molecules and compounds
  9. 13. the total mass of one atom that includes the number of protons and neurtrons
  10. 17. negatively charged, located outside the nucleas and does not contribute to an atom's mass