* High reactivity: Alkali metals are the most reactive group of elements on the periodic table. They readily lose their single valence electron to form cations (+1 charge), making them highly reactive with water, oxygen, and other elements.

* Formation of compounds: This reactivity means alkali metals quickly combine with other elements to form compounds. For example, they form salts with halogens (like sodium chloride - table salt), oxides with oxygen (like sodium oxide), and hydroxides with water (like sodium hydroxide).

* Limited existence: The only place you might find an alkali metal in its elemental form is in trace amounts in some minerals.

It's important to note:

* Alkali metals are highly reactive and can be dangerous to handle, especially in their pure form.

* They are usually stored in inert atmospheres or under oil to prevent reactions with air and moisture.