Explain the following in your own words: a. How were electrons discovered?

b. What has been proven incorrect about Dalton's atomic theory?

c. What did J. J. Thompson discover?

In 2002, the rare earth elements mine in mountain pass, california was closed because

How does a large body of water, such as the ocean, influence climate?

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.