What do periods on the periodic table represent?

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?

Describe the hybridization of each carbon and nitrogen atom in each of the following structures