An atom has 15 total electrons. how many valence electrons does it have in its outer shell

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

Correct relationship between molecular formula and empirical formula

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.