Across
- 3. first element in the periodic table
- 7. most reactive element
- 8. elements with different number of atoms are called
- 9. He stands for
Down
- 1. elements are made of
- 2. Cl stands for
- 4. the periodic table is arrange with the elements atomic
- 5. Ga stands for
- 6. Kr stands for
- 10. Fe stands for