Use Slater's rules to estimate Zeff for the 4f and valence electrons of Hg2+ and O2−; assume for this purpose that all the inner electrons with (n - 3) or less screen a full +1. Express your answers using two decimal places separated by commas.

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