The outer electron configuration of an alkali metal has:

one electron

Group 1A elements are the alkali metals and all have one electron in the outermost energy level because their electron configuration ends in s1.

Explanation:

1 electron

Explanation:

they are reactive becasue they only have one electron.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.