Across
- 2. A substance made from one type of atom.
- 4. Two or more different elements chemically combined.
- 5. Change A change that does not result in a new substance being formed. it cannot easily be reversed.
- 6. Change A change where new substances are formed. This cannot easily be reversed.
- 8. Smallest particle of a chemical element that can exist.
Down
- 1. A vertical column of elements on the periodic table.
- 3. Group of atoms bonded togther by sharing electrons.
- 4. Reactions A reactions where a chemical change occurs.
- 5. Change A horizontal row of elements on the periodic table.
- 7. an atom or group of atoms with an electrical charge, formed by the loss or gain of electrons.