| 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 |
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| 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) |
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