Chemistry

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

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Neptunium on the periodic table is noted by which symbol?
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What alkaline earth metal is formed from the decay of uranium?
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Which of the following is the list of hydrogen halides of group 7A from highest boiling point to lowest?
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Who performed the infamous gold-foil experiment that first detected the existence of the atomic nucleus?
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What element has an atomic number of 40?
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Which state of matter has molecules packed together tightly?
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The study of the effects of light on chemical reactions is known as what?
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What alkali metal is highly radioactive and decays into either astatine, radium, or radon?
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