1. What is the molarity of a solution prepared by dissolving 2.3 moles of CaCl in enough water to make a 2.00 L solution?

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

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

i wish i could but this one is weird give me abc and i can solve it.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)