Give the number of protons, neutrons, and electrons for an atom of Nuclear symbol: 12 over 6 next to C. (a neutral atom). 6 protons, 6 neutrons, and 12 electrons
6 protons, 6 neutrons, and 6 electrons
12 protons, 6 neutrons, and 12 electrons
12 protons, 12 neutrons, and 12 electrons

What is the solubility of substance?

What is the molar mass of a gas that has density of 2.054 g/l

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.