Across
- 3. This is the third element in the periodic table with three protons and its symbol is Li.
- 6. It makes up 78.1% of the Earth's atmosphere.
- 8. It is the second most abundant mineral in the body after calcium.
- 9. It is known as the king of elements Because it forms more compounds than any other element
- 10. Living beings require this for respiration.
Down
- 1. This Element has the lowest boiling point in the periodic table.
- 2. This gas is widely used in luminous signs.
- 4. It is used in light bulbs and it has the highest melting point of all metals.
- 5. It the only non-metal of the group 13 of the periodic table the elements.
- 7. This Element is the second lightest halogen following fluorine.