Because Hydrogen is a gas that has metal in the element
One valence electron.
it has one electron in its outer energy level like all alkali metals
No, hydrogen is a nonmetal. It is grouped with the alkali metals because it has a similar outer shell electron configuration as they do. Hydrogen is something of an oddball among elements. It is rather unique, but share some characteristics with both the halogens and the alkali metals. When the periodic table is divided into groups (noble gasses, halogens, alkali metals, etc.) hydrogen is usually put in its own group.
Alkali Metals
Alkali metals can be substituted for hydrogen. Any of them. They include lithim (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and francium (Fr). The alkali metals are in group one of the periodic table of the elements, and are all stacked up in the column below hydrogen. All the alkali metals are all organized with a lone electron in their outer most shell, or valence shell (in the neutral atom) and all of the alkali metals would like to loan out that electron to anything that would like to borrow it. It turns out that the reactivity of alkali metals are least to greatest from the top of the column to the bottom. This is because of electron screening. A link to our friends at Wikipedia is provided.
Hydrogen has a single valence electron, just like the alkali metals. Unlike them, however, hydrogen prefers to covalently bond instead of forming an ionic bond.
it has one electron in its outer energy level like all alkali metals
No, hydrogen is a nonmetal. It is grouped with the alkali metals because it has a similar outer shell electron configuration as they do. Hydrogen is something of an oddball among elements. It is rather unique, but share some characteristics with both the halogens and the alkali metals. When the periodic table is divided into groups (noble gasses, halogens, alkali metals, etc.) hydrogen is usually put in its own group.
Alkali Metals
Alkali metals can be substituted for hydrogen. Any of them. They include lithim (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and francium (Fr). The alkali metals are in group one of the periodic table of the elements, and are all stacked up in the column below hydrogen. All the alkali metals are all organized with a lone electron in their outer most shell, or valence shell (in the neutral atom) and all of the alkali metals would like to loan out that electron to anything that would like to borrow it. It turns out that the reactivity of alkali metals are least to greatest from the top of the column to the bottom. This is because of electron screening. A link to our friends at Wikipedia is provided.
The electron configuration of hydrogen is similar with that of alkali metals.
Group 1- the Alkali metals and also Hydrogen.
Hydrogen has a single valence electron, just like the alkali metals. Unlike them, however, hydrogen prefers to covalently bond instead of forming an ionic bond.
As with all alkali metals, hydrogen has one electron in its outermost shell.
(A similar relationship exists in Group 1, which includes hydrogen and the alkali metals. All have the same valence configuration, but hydrogen is never included as a member of the alkali metals family.)
hydrogen
For example hydrogen is released when alkali metals react with water.
Hydrogen is placed in group 1, along with alkali metals