Which sub level would an oxygen atom be found in on the periodic table of elements

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible?

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

How many absorptions would you expect to observe in the 13c nmr spectra of the following molecules? a) 3-chloropentane b) cis-4-methyl-2-pentene