Question

sodium, potassium, and cesium belong to which group?
alkali metals
halogens
alkaline earth metals
inner transition metals

Explanation:

Sodium (Na), potassium (K), and cesium (Cs) are in Group 1 of the periodic table. Elements in Group 1 are known as alkali metals. They have one valence - electron and are highly reactive. Halogens are in Group 17, alkaline earth metals in Group 2, and inner transition metals are in the f - block.

Answer:

alkali metals