Question 10 of 10 At what point is the half-life of a radioactive isotope reached?
O A. When all the parent nuclei in a sample have become daughter
nuclei
OB. When half the daughter nuclei in a sample have become parent
nuclei
O C. When all the daughter nuclei in a sample have become parent
nuclei
O D. When half the parent nuclei in a sample have become daughter
nuclei
SUBMIT

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

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.

What three things does a balanced equation show you?