ATOMS, ELEMENTS, COMPOUNDS AND MIXTURES

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Across
  1. 2. a positively charged particle found in an atom
  2. 4. An atom that has lost or gained neutrons
  3. 7. The number of Protons in an Atom
  4. 9. Atoms that have lost or gained electrons
  5. 12. The relative atomic mass of protons and neutrons
  6. 13. these have high melting and boiling points and are good conductors of heat and electricity
  7. 15. A negatively charged particle found in an atom
  8. 18. two or more atoms bonded together
  9. 19. A neutral particle found in an atom
  10. 20. The table that shows all of the known elements ordered by atomic number
Down
  1. 1. name for the columns on the periodic table
  2. 3. name for the rows on the periodic table
  3. 5. the number of electrons in an atom and how many shells it has
  4. 6. Group 7 elements because they have 7 electrons on their outer shell
  5. 8. where the mass of an atom is found
  6. 10. The simplest form of matter
  7. 11. Substance made from only one kind of atom
  8. 14. two or more substances not chemically bonded
  9. 16. Found by adding together the number of protons and neutrons in an atom
  10. 17. Two or more elements bonded together