Chemical properities
Protactinium forms compounds with the halogens ( fluorine, chlorine, bromine, and iodine ) and with hydrogen.
What elements does protactinium react with?
Protactinium metal is a dense, silvery-gray material with a bright metallic luster which it retains for some time in air but it does readily react with oxygen, water vapor and inorganic acids to form various compounds.
What is protactinium mostly used for?
Protactinium is used mainly for research purposes. Protactinium-231 combined with the thorium-230 can be used to date marine sediments.
