When a strontium atom loses two electrons, it becomes a(n) with a charge of

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

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.