What are the two most important alkali metals? why are they so important?

sodium and potassium; lithium and potassium, or francium and lithium are important alkali metal. they are so reactive with air and water, they are generally stored in oil. Cesium and rubidium are used to make atomic clocks. Cesium clocks are considered the most accurate of all clocks. Sodium and potassium both play an important role in biological life on Earth.They are water soluble, basic and very reactive. Alkali metals are the least electronegative group, and tend to react best with nonmetals and water. The sodium and potassium pump are important in maintaining equilibrium amounts both inside and outside the cell.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.