Specify the number of protons and electrons in each of the following ions. A) Se^2−, needed for certain enzymes, including several antioxidants. Express your answers as integers separated by a comma. B) F−, used to strengthen tooth enamel Express your answers as integers separated by a comma.   C) Mg2+, needed for bones and teeth Express your answers as integers separated by a comma.   D) Ca2+, needed for bones and teeth Express your answers as integers separated by a comma.

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