Chemistry

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Across
  1. 4. smallest building block of matter
  2. 7. positively charged component of atom
  3. 9. substance made by only one kind of atom
  4. 10. two or more atoms joined together
  5. 12. electrons in the outer shell
  6. 14. substance composed of two or more kinds of atoms chemically joined
  7. 17. number of protons
  8. 18. atoms that gain electrons
  9. 19. different number of protons and electrons
Down
  1. 1. vertical column of periodic table
  2. 2. elements that conduct heat and electricity
  3. 3. neutral charged component of atom
  4. 5. element has different number of neutrons
  5. 6. negatively charged component of atom
  6. 8. horizontal column of periodic table
  7. 11. energy level that electrons are in
  8. 13. elements that do not conduct heat or electricity
  9. 15. atoms that lose electrons
  10. 16. number of protons and neutrons combined