The highly reactive elements in group 7a are known for forming salts. what are they called? a. transition metals b. metalloids c. halogens d. noble gases

Non renewable resources like petroleum eventually

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

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.