How would you explain to an elementary school student what the periodic table is?

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

Can anyone answer these questions? ? i need it before 1: 00pm today

Which part of the healthcare system could best explain how a pharmaceutical drug works