The hydrogen astatide - HAt.
There are more than three such elements: at least hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine, probably also astatine.
Examples of elements are... Hydrogen, Helium, Oxygen, Sodium, Bromine, Astatine, Bismuth and Mercury.
Hydrogen, the other halogens. However, have a look in Wikipedia under 'Astatine'.
Formation of hydrogen astatide - HAt.
The diatomic elements are: Hydrogen (H2), Nitrogen (N2), Oxygen (O2), Fluorine (F2), Chlorine (Cl2), Bromine (Br2), Iodine (I2), and probably astatine (At2), although I don't know whether enough astatine has ever been made to be sure!
Hydrogen monoxide is made of two elements, hydrogen and oxygen.
Polyethylene is made from the elements Carbon and Hydrogen only.
Astatine is a compound made from two or more different elements. Hope this helps! :D
Astatine wouldn't form salt as readily as other elements in Group 17. Astatine is a radioactive metalloid. Other elements in Group 17 are nonmetals.
Astatine is a member of the group 17 (halogens) of the periodic table of elements.
1. astatine is a halogen that is radioactive.
hydrogen