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The metal with the highest electrical conductivity is ____.
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calcium (Ca)
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A yellow, solid, nonmetal element is ____ (brimstone).
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carbon (C)
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All ____ atoms have six protons.
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iron (Fe)
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The metal component of the hemoglobin protein is ____.
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mercury (Hg)
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A heavy, silver, toxic, liquid metal element is ____.
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oxygen (O)
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About 21% of the Earth's atmosphere is ____.
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potassium (K)
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Chalk, limestone, and marble contain ____ carbonate.
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silver (Ag)
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Li, Na, and ____ are highly reactive alkali metals.
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sulfur (S)
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