Hydrogen is a highly flammable element, with the potential to become a non-polluting alternative to gasoline.
- Hydrogen is the element with the lowest density.
- Hydrogen is highly flammable and extremely reactive.
- Hydrogen makes water when combined with oxygen.
- It is estimated that three-quarters of the mass of the Universe is made up of hydrogen.
Hydrogen is an invisible gas, and is the element with the lowest density.
Its very low mass is due to hydrogen atoms containing only one proton.
Pure hydrogen normally exists as two of these hydrogen atoms bonded together, forming a small molecule.
Hydrogen molecule H2
When combined with oxygen, hydrogen makes water.
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