red or pink, depends on the valence shell that the electrons jump to
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Hydrogen gas in space does not usually emit visible light, so it is not really a specific color. However, in certain conditions where hydrogen absorbs or emits specific wavelengths of light, it can appear pink or red.
Hydrogen is not a noble gas.
Hydrogen is the lightest gas.
Hydrogen gas is H2. Oxygen gas is O2.
If the gas in the test tube is hydrogen, the substance inside would be hydrogen gas since the gas in the tube is hydrogen itself.
45,0 grams of hydrogen gas have 135,5.10e23 atoms.