6. Sally wants to test how the type of light affects the height of bean plants. She uses three different types of light bulbs: LED, incandescent, and CFL. She exposes the plants to the lights for thesame amount of time and plants the
seeds in containers that are the same size, with the same type of soil, and waters them with the same amount of
water each day. She measures the height of the plants using a ruler and records the growth each day. Which of the
following is/are controls in the experiment?

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

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