The story
So named because it is the isotope of hydrogen that has four nucleons (a proton and three neutrons).
Etymology from Wiktionary, CC BY-SA 4.0.
hydrogen-4
Today it means: Synonym of quadrium (“isotope of hydrogen”). Full definition →
Today it means: Synonym of quadrium (“isotope of hydrogen”). Full definition →
So named because it is the isotope of hydrogen that has four nucleons (a proton and three neutrons).
Etymology from Wiktionary, CC BY-SA 4.0.