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