Which alkali metal is radioactive in nature?

Which of the following statement(s) is/are incorrect regarding property of alkali metals ? I. Alkali metal on reaction with water produces a gas as a by product which burns with popping sound. II.All alkali metal hydrides are ionic in nature.

a. Name the alkali metals which form superoxides on heating in excess of air. b. Name the alkali metal which floats on water without any apparent reaction with it. c. Name the main factor which is responsible for the anomalous behaviour of lithium. d. What is the general name for element of group 1 ? e. Give the name of the alkali metal which is radioactive. f. Name the alkali metal which shows diagonal relationship with magnesium. g. Name teh alkali metal which acts as the strongest reducing agent in aqueous solution.

Why are alkali metals not found in nature?

.Which of the alkali metal is having least melting point?

Why are alkali metals not found free in nature ?

The most widely distrubuted alkali metals as chloride in nature is/are