Which element is the least reactive, Li, Be, Mg, Na?

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Which statement would indicate the presence of an acid

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.