Before mendeleev, newland observed a distinct pattern in the elements and proposed the law of octaves. what were his conclusions

Draw the lewis dot structure for each of the following polyatomic ions

How many grams of phosphorus are contained in 5.09 moles of phosphorus?

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.