Across
- 3. is a colorless gas with no odor.
- 5. has the lightest weight.
- 8. has 45 neutrons.
- 10. was discovered in 1894.
- 11. is frequently used in soap.
- 13. can be melted in the palm of your hand.
- 14. is capable of combining with other elements.
Down
- 1. was discovered in 1755.
- 2. was discovered in 1875.
- 4. has a reddish color.
- 6. has a smell of an egg.
- 7. has an atomic number of 22.
- 9. has a mass of 50.942.
- 12. has 14 electrons, neutrons and protons.