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