Across
- 4. A gas with an atomic mass of 84.80.
- 5. Atomic number is 1.
- 7. Commonly known to be used in balloons to make them float.
Down
- 1. Commonly known to be used for making jewellery.
- 2. An element with a symbol of Fe.
- 3. an element with a symbol of Na
- 6. atomic mass of 16.00