Not for humans
The forgotten nutrient and the most important is water.
It is used in neon signs
Neon is a noble gas placed in the group 18 of the periodic table of Mendeleev.
calcium
It glows when electrically stimulated.
Neon-20 is used for the same things as any other natural isotopes of neon. E.G. it is used to make neon lights and helium-neon lasers. Neon-20 isotopic concentration may be important for some geological or volcanlogic studies.
Uranium is not a nutrient !
Calcium
Neon is important primarily for industrial and commercial use, such as neon lighting and advertising signs. It is also used in cryogenics to create very low-temperature environments. In terms of Earth's atmosphere, neon is a minor component and does not play a significant role in environmental or biological processes.
An important nutrient would be beta carotene, which the body uses to make Vitamin A.
Water probably
thiamine