Chemistry

What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?

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Actinium on the periodic table is noted by which symbol?
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Which of the following can possess chirality?
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Which of the following analytical techniques gives an "ion peak"?
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Which would NOT be used for the polymerization of ethylene?
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What are the main two elements that undergo fusion to power the sun?
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Which of the following words mean "made stronger"?
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What symbol appears on the periodic table for Oxygen which has the atomic number 8?
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Which element has the chemical symbol Ca?
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