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A very heavy, stable metal used to shield radiation is ____.
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carbon (C)
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Common oxidation states for carbon (C) and ____ are -4 and +4.
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copper (Cu)
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All ____ atoms have six protons.
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fluorine (F)
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About 21% of the Earth's atmosphere is ____.
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lead (Pb)
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About 78% of the Earth's atmosphere is ____.
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nitrogen (N)
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Bronze is an alloy of mostly ____ mixed with tin (Sn).
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oxygen (O)
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A yellow, solid, nonmetal element is ____ (brimstone).
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silicon (Si)
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The most reactive and electronegative element is ____.
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sulfur (S)
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