( i need this asap) An unknown element has an isotope that has a mass of 120.903 amu with 57.4 % abundance and a second isotope with a mass of 122.9042 amu.

1. Remember % has to equal 100. What is the percent abundance of isotope two?

2. Find the atomic mass of the element.

3. Identify the identity.

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.