Which of the following represents a chemical change. a water to boiled b paper is torn c glass is shattered d wood is burned

Which other elements contain the same number of outer electrons as sodium

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

Which statement best describes the he properties of iconic compounds ?