Across
- 3. building blocks of matter
- 5. another name for a "column"
- 6. all of the elements are organized in this
- 8. another name for a "row"
- 9. located at the center of the atom
Down
- 1. the small number located below the element symbol
- 2. the number in the top left corner of the element square
- 4. always written with only one capital letter
- 7. made of 2 or more elements