Express 0.021 in scientific
notation.
[ ? ]10...
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Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen
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Calculate the number of molecules present in 0.750 mol of mgo.
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An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons
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