Which of these are characteristics of good experimental design

Good experimental design tests only one variable at a time. -Good experimental design plans how to record data so the data can be published. -Good experimental design involves only one trial in an experiment. -Good experimental design includes logging every step and data point of the experiment

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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