Atom a has an atomic number of 19 and a mass number of 40. atom b has an atomic number of 20 and a mass number 40

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

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.