Across
- 2. a vertical column of elements on the periodic table
- 4. a reaction where a chemical change occurs
- 6. an atom or group or group of atoms with an electrical, formed by the loss or gain of electrons
- 8. change a change where new substances are formed. this can not easily be reversed.
- 9. a substance made from one type of atom
- 10. smallest particle of chemical element that can exist
Down
- 1. two or more different elements chemically combined
- 3. change a change that does not result in a new substance being formed. it can be reversed
- 5. group of atoms bonded together by sharing electrons
- 7. a horizontal row of elements on the periodic table