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| 1. |
is an atom that has lost one or more electrons |
| 4. |
a chemical change which absorbs heat energy |
| 5. |
a chemical change which releases heat energy |
| 6. |
a substance that reacts with another substance |
| 7. |
when a material changes state |
| 8. |
is liquids or gases at room temperature |
| 9. |
are the most reactive especially in air or water |
| 12. |
made up of one type of matter |
| 13. |
1 |
| 15. |
3 |
| 16. |
is an atom that has gained one or more electrons |
| 17. |
is the most reactive non metal |
| 20. |
6 |
| 21. |
2 |
