Across
- 1. new substance produced in a chemical reaction between reactants
- 5. Are results from a chemical reaction
- 6. formed when at least one metal and nonmetal combines
- 9. anything on the periodic table and made up of only one type of atom
- 12. when two nonmetals combine
- 13. absorbs heat
- 15. metals most reactive metals especially in air and water and moving down the column the element get more reactive
- 17. the most stable and reactive and can make new substances sometimes
- 18. substance that's at the start of the reaction
- 19. uses words to define a compound
- 20. is the average mass of an element in atomic mass units
- 22. when oxygen reacts with a substance to form a new substance and gives off energy
- 23. an atom or group of atoms that has become electrically charged
- 24. 7 Rows go to metals to non-metals and the atomic number increase by 1
- 25. most reactive non-metals and can be used to form new and helpful substances
Down
- 2. uses symbols and numbers to represent a compound
- 3. represents the number of atoms
- 4. two or more substances combine to form new substances
- 7. tells you the number of protons and electrons
- 8. 18 colums and is similar in chemical properties
- 10. releases heat
- 11. made up of one type of matter and has unique set of characteristic
- 14. anything that has mass and occupies space
- 16. can be in between metals and non-metals
- 21. slow chemical change, when oxygen in the air reacts with metal. The metal is decomposed