Are alkali metal ions colourless as well as diamagnetic?

Alkali metal have only one electron in their valance shell and general electronic configuration is ns1. When they are converted into ions this electron of valance shell get removed and only full filled orbital are left. Due to this all the remaining electron are paired in alkali metal ion so it is diamagnetic. read more

Due to this all the remaining electron are paired in alkali metal ion so it is diamagnetic. All the orbital of alkali metal ion is full filled that is why it is highly stable so the electronic Transition cant take place easily hence the ions are colourless. read more

(iv) Li + being smallest in size has maximum degree of hydration and that is why lithium salts are mostly hydrated, LiCl. 2H 2 O also lithium ion being heavily hydrated, moves quite slowly under influence of the electric field and, thus, is the poorest conductor current among alkali metals ions It can, hence, be concluded that it is the degree of hydration as well as the size of the ion is responsible for current carried by the ion. read more