Hydrogen (H, 1)

Isotope of hydrogen

Protium (¹H, stable, 99.98%)

Deuterium (²H, stable, 0.02%)

Applications:

because it has an even number of nucleons it is transparent to NMR, and therefore is useful in solvents for NMR spectroscopy

Heavy water

Cody'sLab had a nice 5 video series on making it at home! But the United States Government asked him to take it down as suggested at Video "What's Been Going On With Cody'sLab? by Cody'sLab (2019)" at youtu.be/x1mv0vwb08Y?t=84.

Here's a copy online as of 2020: www.youtube.com/watch?v=bCXB6BdMh9Y

Semiheavy water

Girdler sulfide process

Tritium (³H, 12 y)

Used in:

Hydrogen compound

Hydrogen cyanide

Water

"Water" is the name for both:

the chemical compound with chemical formula H₂O
the liquid phase of the chemical substance composed of the above chemical compound

Figure 1.
Water in a glass
. Source.

Figure 2.
Ball-and-stick model of a water molecule
. Source.

Figure 3.
Simplified phase diagram of water
. Source. Note the triple point and critical point visible. Phase diagrams are so cool!

Figure 4.
Phase diagram of water
. Source. Note all the obscure phases of ice.

Water molecule ( $H_{2} O$ )

Figure 1.
Ball-and-stick model of a water molecule
. Source.

Phase of water

Ice

Ice is the name of one of the solid phases of water.

In informal contexts, it usually refers to the phase of ice observed in atmospheric pressure, Ice I_h.

Phase of ice

Ice I_h

Snow

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Codex  0 Created 2026-10-05 Updated 2026-11-05

Hydrogen is the chemical element with atomic number 1 and symbol

H

. A neutral hydrogen atom has one electron, while its most abundant nucleus contains a single proton. Elemental hydrogen commonly forms molecular hydrogen,

H_{2}

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