A student carefully mixes two clear liquids in a beaker. The student then observes the beaker for 60 seconds, watching
for signs of a chemical reaction. As she waits, she notices that
some of the chemicals have splashed onto her hand. She goes
to the paper towel dispenser and wipes her hand clean, then
returns to her observations. After careful observation, the
student concludes that no chemical reaction has taken place.
Which of the following would have been the best safety
practice for the student to have used for this experiment?

The student should have worn splash goggles, an apron, and gloves during the investigation.

Explanation:

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