Which element has the electron configuration 1s22s22p63s23p3? a. scandium b. arsenic c. phosphorus d. krypton

What is impossible to do with a hypothesis

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

No copying 15 pts how does a free-body diagram tell you about the net force on an object?