The number of protons in an atom is known as its atomic A
number
B
mass
с
phase
D
bond

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

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.

Which metals are called noble metals