What is the use of liquid electrolyte?

Although progress has been made in enhancing the conductivity of solid electrolytes, particularly the polymeric ones, liquid electrolytes are still used in most electrochemical systems. The solvent properties, and dynamics of ion solvent interactions, must be understood in designing new electrolytes.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6