Write the correct number of protons and neutrons and electrons in the following ions aluminum (+3) !

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

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

What term describes technology that operates on an atomic level