Across
- 2. This element is the most abundant in the air of the Earth, when it is liquid it is used to cool things instantly.
- 3. It was actually discovered in America, and was later brought to Europe, an incredible metal with the atomic number 78.
- 5. It is one of the most valuable and useful metals, it is used in jewelry and scientific experiments. Has one of the highest melting points.
- 8. The element was more normally used in the past to travel in the sky from one place to another, but we stopped it because it was very inflamable.
- 9. It was the fifth radioactive element to be discovered, it is a health hazard and the heaviest gas known. It can only combine with other substances in extreme conditions.
- 10. This element is the most important for humans, and is used to breathe and form water molecules.
Down
- 1. This element was discovered in 1807 by Humphry Davy, it’s in the s block and it has a melting point of 63.5 ° C
- 2. A noble gas that is odorless and colorless, has two-thirds the density of air, its name came from the greek word new, and is used at parties in the dark.
- 4. This element is the only metal in the liquid phase at room temperature, this is used to make thermometers.
- 6. Is the second lightest element in the halogens group, is a toxic and corrosive gas that is irritating to the eyes and the respiratory system. Is used in the pools to clean them.
- 7. A reddish ductile metal that is usually used to make roofs, is placed in the group 11 and when it is at room state is solid.