Chemistry

How many elements in the actinide series are not radioactive?

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What is the chemical combination of silicon and oxygen called?
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What contain most of the calcium ion in the human body?
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Phosphorus is the 13th element to be discovered, where did it come from?
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Which is not a component of black powder?
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What energy is stored in the form of chemical compounds?
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Which of the following is found in stinging insects?
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Which of these is used to determine the strength of a chemical bond?
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What is the second most common metal on Earth, and the most widely-used metal?
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