Chemistry

Which of these is an element?

More Questions from Chemistry
The temperature at which gas becomes liquid is considered what?
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What is best described as the separation of a material into elements or parts?
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What is the half-life of Rubidium-Strontium 87?
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What is an atom that has more electrons than normal referred to as?
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What is the approximate heat of vaporization of water at its boiling point?
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What is the first element on the periodic table?
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Which Middle Eastern country was widely accused of using chemical weapons in 2013?
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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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