Chemistry

Which of these can take on either a positive or negative charge, typically being a protein?

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What is the final product of the Uranium 238 decay chain?
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What is the only metallic element that is liquid at standard conditions for temperature and pressure?
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Which element is a poisonous gas that combines with sodium to form table salt?
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The first element on the periodic table of elements with an atomic number of 1 is?
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Which type of matter has definite volume but no definite shape?
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Which of the following words mean "made stronger"?
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Which electron that would emit the greatest amount of energy by dropping electron levels?
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What is the name of the temperature at which Helium I becomes Helium II?
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