Which statement describes the general trends in electronegativity and metallic properties as the elements in period 2 are considered in order
of increasing atomic number?
(1) both electronegativity and metallic properties decrease.
(2) both electronegativity and metallic properties increase.
(3) electronegativity decreases and metallic properties increase.
(4) electronegativity increases and metallic properties decrease.

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.