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Which six elements are classified as alkali metals?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — alkali metal Modern version of the periodic table of the elements (printable).

The six elements classified as alkali metals are:

Lithium (Li)
Sodium (Na)
Potassium (K)
Rubidium (Rb)
Cesium (Cs)
Francium (Fr)

These elements are located in Group 1 of the periodic table. While hydrogen also appears in Group 1 because it has one electron in its outermost shell, it is not considered an alkali metal because it is a gas at room temperature rather than a metal.12