What happens to the potential energy of the molecules in a reaction? O A. The potential energy of the products is equal to that of the reactants. B. The reactants only lose potential energy when forming products. C. The potential energy of the molecules does not change in a reaction. D. The potential energy of the molecules changes during a reaction.​

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

u i forgot the answer?

i'm pretty sure its b i might be wrong though!

6.4 cm (max) - 25 cm (min)