Which sequence correctly ranks elements from largest to smallest atomic radius?

Br, As, K

Cs, Ba, At

F, S, As

Mg, Ca, Ba

0.09 moles of sodium sulfate in 12 ml of solution

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.