Hydrogen exists in the elemental form as the gas H
2.
Compounds of hydrogen and most other elements in the periodic table exist. In most cases these
can be produced by direct reaction of H
2 with the second element under appropriate conditions.
Compounds containing two elements are referred to as binary compounds. The binary compounds of hydrogen
are represented by EHn where n depends on the location of element E in the periodic table.
In the scheme associated with this module you will learn how to deduce n in the formula of these compounds for several different elements.
The
acid-base properties of EHn also depend on the position of E in the periodic table.
In the second section of this module, the trends in acidity and basicity of these compounds and the corresponding En– ions will be explored.