Why is it unlikely to find pure alkali metals in nature?

 High Reactivity

Explanation:  Alkali metals are the metals which are kept in the group 1 which is also known as S -Block elements.

The electronic configuration of the elements can be written as ns1 .

These are considered to be the most reactive elements of the whole periodic table because their outermost shell has only 1 vacant electron and thus are in need of only 1 electron to complete its duplet or either they can also lose that  one electron .

This the reason they can never be found pure in the nature .

increased stability in the completion of fluorine's outer shell.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds