What does the symbol "e3" represent?
a the energy required to remove the third valence electron
b the energy of electrons in the third energy level
c the energy required to remove an electron in the third energy level
d the energy required to remove three of the outermost electrons

your answer to your question is B

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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