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The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion