hydrogen
Pluralhydrogens (some meanings)
- 1The lightest of all chemical elements, written with the symbol H.
Like the first and simplest block in a huge set of building blocks.
Hydrogen is the lightest element in the universe.
Stars are made mostly of hydrogen.
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- 2A colorless gas with no smell that catches fire very easily.
Like the gas in a floating balloon, but one that can also catch fire.
Hydrogen burns with a pale blue flame.
Balloons filled with hydrogen float because the gas is so light.
- 3A measured amount of the gas that can be used, stored, or tested.
The lab ordered a fresh tank of hydrogen for the experiment.
They measured how much hydrogen was left in the cylinder.
- 4A single atom of the lightest element, with one proton and one electron.
A water molecule contains two hydrogen atoms and one oxygen atom.
Each hydrogen has just one electron circling its nucleus.
Note
- 5A single molecule of the gas, made of two atoms joined together.
Each hydrogen splits into two atoms when heated enough.
One hydrogen is built from a pair of bonded atoms.
- 6A form of the lightest element that has one proton and no neutrons.
Ordinary water is made mostly with hydrogen rather than its heavier forms.
Almost all hydrogen in nature has a single proton and no neutron.
Similarprotium
Note
Practice
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Origin
From French hydrogène. It comes from Greek words meaning "water" and "to bring forth."