atomic hydrogen

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hydrogen in the form of single atoms, rather than molecules, which makes it extremely reactive.

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Also called active hydrogen.

What remains unresolved is the reason why measurements, relying on different spectroscopic methods in atomic hydrogen, return different values for the charge radius of the proton.
A Breakthrough in Measuring the Building Blocks of Nature - Facts So Romantic|Subodh Patil|January 8, 2021|Nautilus
Because muons are about 200 times heavier than electrons, their lowest energy orbital configurations are much more tightly bound around the proton than are electrons in atomic hydrogen.
A Breakthrough in Measuring the Building Blocks of Nature - Facts So Romantic|Subodh Patil|January 8, 2021|Nautilus
Following this line of reasoning to its logical conclusion, the way to achieve world peace is to give everyone atomic bombs.
Santa Fails One More Time|P. J. O’Rourke|December 27, 2014|DAILY BEAST
Methane (chemical formula CH4) is one of the simplest hydrocarbons, which literally means “containing hydrogen and carbon.”
Methane on Mars: Life or Just Gas?|Matthew R. Francis|December 17, 2014|DAILY BEAST

From that, they extracted the ratio of the number of deuterium atoms to the number of hydrogen atoms.
Are Comets the Origin of Earth’s Oceans?|Matthew R. Francis|December 14, 2014|DAILY BEAST
They found that there are roughly 1,900 hydrogen atoms for each deuterium atom in the water on Comet 67P.
Are Comets the Origin of Earth’s Oceans?|Matthew R. Francis|December 14, 2014|DAILY BEAST
Deuterium is an isotope of hydrogen containing a proton and neutron in its nucleus, while normal hydrogen has only a proton.
Are Comets the Origin of Earth’s Oceans?|Matthew R. Francis|December 14, 2014|DAILY BEAST
Hydrogen sulphid is easily prepared in the simple apparatus shown in Fig. 30.
A Manual of Clinical Diagnosis|James Campbell Todd
It is allowed to cool, and hydrogen sulphid gas is passed through it for about five minutes.
A Manual of Clinical Diagnosis|James Campbell Todd
Ammonia is a compound of nitrogen and hydrogen, but it cannot be formed by the direct union of these gases.
Elements of Agricultural Chemistry|Thomas Anderson
We only know that under certain conditions the old atomic associations break up, and new ones are formed.
Outlines of the Earth's History|Nathaniel Southgate Shaler
One morning he found that the amount of hydrogen was scarcely perceptible; still there was water in the pit.
Black Diamonds|Mr Jkai