List the number of protons, neutrons, and electrons ( there is a pic)

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

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

When a scientific theory has been tested and proved by the scientific community, it becomes a law