Moseley's research suggested that elements should be sorted by increasing atomic: number

mass

radius

stability

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

What is the relationship of air masses and the temperature of oceans?

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.