hydrogen-3
atomic number 1
h
hydrogen
anæsthetic
carbonic
cesium
cobalt
cobalt-60
cyanide
deuterium
explainin'
groundwater
helium
hydrocyanic
isotope
lithium
microfusion
monoxide
neptunium
nitrous
pain-killing
plutonium
protium
quadrium
refrigerant
saltwater
thorium