Metales alcalinos

Alkali metals, found in Group 1 of the periodic table, include lithium, sodium, potassium, rubidium, cesium, and francium. These metals are characterized by their softness, low density, and high reactivity, especially with air and water, forming alkaline compounds. Their reactivity increases with higher atomic numbers, necessitating storage in oil to prevent corrosion or combustion.

What is the trend in reactivity among alkali metals based on their atomic number?

Why are alkali metals usually stored in oil?