do you know your vocab? :D

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Across
  1. 3. comes in two varieties: positive and negative
  2. 5. the total number of protons and neutrons in a nucleus
  3. 9. has a NUETRAL electric charge
  4. 12. an electron of an atom located in the outermost shell of an atom
  5. 14. lowest energy level of a system
  6. 15. a rows and columns arrangement of the chemical elements
  7. 16. has a POSITIVE electric charge
  8. 19. has a NEGATIVE electric charge
Down
  1. 1. a chemical element with the symbol Mg and atomic number 12
  2. 2. positively-charged ions
  3. 4. fixed distances from the nucleus of an atom where electrons may be found
  4. 6. the number of protons in the nucleus of an atom
  5. 7. a pure substance consisting of only one type of atom which all have the same numbers of protons in their nuclei
  6. 8. the quantity of matter contained in an of an element
  7. 10. he positively charged center of the atom consisting of protons and neutrons
  8. 11. negatively-charged ions
  9. 13. A form of a chemical element in which the atom have the same number of protons but with a different number of neutrons
  10. 17. a regular, repeating path that one object in space takes around another one
  11. 18. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons