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Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?
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Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.
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Identify the correct mole ratio for each substance. sodium chloride (nacl) na: cl = 1: ammonium nitrate (nhno) h: o = 4:
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Which element has 13 protons and 8 neutrons?...
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