Chemistry

What alkali metal is highly radioactive and decays into either astatine, radium, or radon?

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What is the abbreviation for an element called?
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What actinide was once used to power pacemaker batteries, but has since been replaced?
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Which state of matter has molecules packed together tightly?
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What element was named after the planet Uranus?
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Which of the following is not a common brominating agent?
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What is the third most abundant gas in the earth's atmosphere?
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Europium on the periodic table is noted by which symbol?
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Which of the following is the symbol for Iron?
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