Across
- 1. the name for the horizontal rows of elements
- 8. Elements which have existed on Earth since its formation
- 9. a family of elements are negatively charged and are poor conductors
- 10. when two elements with opposite charges exchange electrons
- 11. a family of elements which are positively charged and are good conductors
Down
- 2. Elements which have been created in laboratories
- 3. When an element has too many or too few neutrons to be stable
- 4. the name for the vertical columns of elements
- 5. the electric charge of an atom
- 6. an element which has an irregular number of neutrons
- 7. A group of gases which are almost always inert (are not reactive)