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The most reactive and electronegative element is ____.
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argon (Ar)
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An isotope with a half-life of 24,000 years is ____-239.
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copper (Cu)
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Incandescent light bulbs contain ____ filaments.
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fluorine (F)
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The lightest metal is ____. It is used in rechargeable batteries.
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iron (Fe)
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The metal component of the hemoglobin protein is ____.
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lithium (Li)
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Atoms of H, Li, ____, and K each have one valence electron.
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plutonium (Pu)
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An inert gas used in incandescent light bulbs is ____.
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sodium (Na)
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Bronze is an alloy of mostly ____ mixed with tin (Sn).
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tungsten (W)
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