oed eohb xxc WHAT IS HYDROGEN?
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Answer:
a light colourless gas. Hydrogen and another gas (oxygen) form water.
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Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula H₂. It is colorless, odorless, tasteless, non-toxic, and highly combustible.
Symbol: H
Atomic mass: 1.00784 u
Atomic number: 1
Electron configuration: 1s1
Van der Waals radius: 120 pm
Discovered: 1766
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