1) How can particles combine together to form the variety of matter one observes? 2) How can we use the periodic table to predict the properties and the behavior of an element?
3) Where do elements come from?

What is the typical rotational frequency frot for a molecule like n2 at room temperature (25∘c)? assume that d for this molecule is 1å=10−10m. take the total mass of an n2 molecule to be mn2=4.65×10−26kg. you will need to account for rotations around two axes (not just one) to find the correct frequency. express frot numerically in hertz, to three significant figures.