GENERAL KNOWLEDGE

Detailed explanation-1: -Because the alkali metals are very reactive, they are seldom (if ever) found in their elemental form in nature, and are usually found as ionic compounds (except for hydrogen). The alkali metals have only one valence electron in their highest-energy orbitals (ns1).

Detailed explanation-2: -Alkaline Earth metals are very reactive because they readily give up their two valence electrons to achieve a full outer energy level, which is the most stable arrangement of electrons. Reactivity increases from the top to the bottom of the group.

Detailed explanation-3: –Now in the question, the alkali metals are those elements that belong to the group 1 which are from the Lithium to Francium. Therefore, they have only 1 electron in their outermost orbit. Thus, the correct answer is alkali metals have 1 valence electron.

Detailed explanation-4: -Alkali metals are among the most reactive metals. This is due in part to their larger atomic radii and low ionization energies. They tend to donate their electrons in reactions and have an oxidation state of +1. These metals are characterized by their soft texture and silvery color.

Detailed explanation-5: -Group 1 of the periodic table includes hydrogen and the alkali metals. Because they have just one valence electron, group 1 elements are very reactive. As a result, they are found in nature only in combination with other elements. Alkali metals are all solids at room temperature.