Deuterium can replace the normal hydrogen in water molecules to form heavy water ( D 2 O ), which is about 10.6 % denser than normal water ( so that ice made from it sinks in ordinary water ).
22.
Any system or environment that accepts electrons from a normal hydrogen electrode is a half cell that is defined as having a positive redox potential; any system donating electrons to the hydrogen electrode is defined as having a negative redox potential.
23.
Its properties are somewhat distinct from the rest of the hydrogen chalcogenides, since polonium is a metal while the other chalcogens are not, and hence this compound is intermediate between a normal hydrogen chalcogenide or hydrogen halide such as hydrogen chloride, and a metal hydride like stannane.
