Please help me on #1 and #2 i dont understand the table
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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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Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes
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Which other elements contain the same number of outer electrons as sodium
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