How does an electrolytic cell work? OA. Two electrolyte solutions react to cause electrons to flow.
O B. A voltage applied across two electrodes causes electrons to flow.
OC. A salt bridge connecting two electrodes generates electrons.
O D. A spontaneous redox reaction at two electrodes causes electrons
to flow.

a voltage applied across two electrodes causes electrons to flow. (b)

Explanation:

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