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Across 1. ________________ reaction is the making or breaking of chemical bonds 4. this is an atom that loses or gains electrons 5. he discovered the electron 6. positively charged particles in the nucleus 7. the smallest particle of a compound that can still retain the characteristics of the compound 9. simple substances 10. this describes what and how much elements are in a compound 11. this is the smallest unit of an element that can exist alone. 13. a fundamental particle of matter that circles around the nucleus 15. universally recognized unit of weight measurement 16. Recognized by the periodic Symbol "O"

Down 1. ______________ bond shares at least one pair of electrons 2. this represents number of protons in the nucleus (2 Words) 3. Recognized by the Periodic Symbol "H" 4. atoms that have different numbers of neutrons 8. ______________ table of elements 12. neutral particles in an atom 14. this is the center of an atom