Across
- 1. left to right on a periodic table
- 3. element not having a metal character
- 5. gives off heat and energy
- 7. represents the element
- 9. properties between metals and nonmetals
- 11. one substance made from atoms
- 12. any closed system subjected to no external forces, mass is constant irrespective of its changes in form
- 14. absorbed energy; cold temperature
- 17. represents the number of protons and electrons
- 19. goes around the nucleus, area where electrons are
- 20. combining two or more substances
- 22. substance that is a conductor of electricity and heat
- 24. positive electrical charge
Down
- 1. substance obtained from another substance through chemical change
- 2. created the periodic table
- 3. neutral electrical charge
- 4. substance that changes when combined with other substances through chemical reaction
- 6. group of rare gases
- 8. amount of electrons on the outer shell of an atom
- 10. smallest particle of an element
- 13. mass given of an element
- 15. negative electrical charge
- 16. center part of an atom
- 18. one or more atoms of the same substance
- 21. an external layer of metal
- 23. top to bottom on a periodic table