Study of the First Elements – Notes
Position of Hydrogen in the Periodic Table
Hydrogen is the first element in the periodic table.
The atomic number of hydrogen is one.
Hydrogen has only one electron in the k-shell of its atom.
Hydrogen has a dual nature; it resembles the alkali metal as well as the halogens.
Like alkali metals, hydrogen has one electron in its valence shell.
Hydrogen burns in oxygen to form water.
Hydrogen combines with non – metals such as oxygen, sulphur and chlorine to form water, hydrogen sulphide and hydrogen chloride.
Hydrogen has the tendency to form a cation by losing an electron.
Hydrogen acts as a reducing agent.