How is a radioactive element different from a stable element?

Why did southern business leaders want to increase the number of slaves

Which statement best explains the relationship between an area is geography and the temperature of its surface water

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