In a redox reaction, why does an element's oxidation number decrease?
O A. An element's oxidation number decreases because it gained electrons.
B.
An element's oxidation number decreases because it exchanged electrons.
• C.
An element's oxidation number decreases because it lost electrons.
OD. An element's oxidation number decreases because it was heated.

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.

On the periodic table, elements are arranged by which of the following. a. mass numbers. b. increasing atomic number. c. alphabetical order. or d. density

The time that is taken by neptune once around the sun is called