Suppose that an unknown nuclear material is found to have a physical density of 18 g/cm3 and a molecular weight of 6. How many moles of the material are contained in 18 g of it? Name at least two...

Suppose that an unknown nuclear material is found to have a physical density of 18 g/cm3 and a molecular weight of 6. How many moles of the material are contained in 18 g of it?

Name at least two reasons why most nuclear cross sections tend to get larger as the energy of an incoming particle decreases. Can you think of at least one exception to this rule?