Question

explain genral characteristics of alkali metal​

Answer 1

Alkali metals are silvery, soft, and not very dense. They can easily be cut with a butter knife, and cesium can even melt in the palm of your hand. They have low melting points and are incredibly reactive--so reactive that they must be stored in special solutions or containers to prevent an unintended reaction. Part of what makes alkali metals so reactive is that they have one electron in their outermost electron layer. Like so many other metals, the alkali metals want nothing more than to have electronic structures like their famously stable and unreactive cousins, the noble gases.

Answer 2

they react vigorously with water to produce hydrogen and an alkali solution.