You think probable to hydrogen.
Hydrogen
Hydrogen
hydrogen
That is not true. The first element in a period may be active or inactive, depending on the specific electron configuration of the element. For example, the first element in period 1, hydrogen, is not considered an active element.
The element Hydrogen (H) has only 1 electron. When it loses it, it becomes the Ion H+.
Hydrogen, of course. On some periodic tables you still see it in the alkali position and heading the halogen column to.
This is the valence electron.
The alkali metal, sodium, is an element.
Hydrogen
Lithium is an alkali metal.
All alkali earth metals have 2 valence electrons.
Cesium (Cs) is the alkali metal that requires 4 electron shells as it has the electron configuration [Xe] 6s1.