Calculate the average atomic mass of rubidium. rubidium has two isotopes, & rb and 7rb. 85rb has an atomic mass of 84.912 amu and occurs at an abundance of 72.17% 87rb has an atomic mass of 86.909 amu and occurs at an abundance of 27.83% show your work.

The average atomic mass of Rb is 85.47 u.  

The average atomic mass of X is the weighted average of the atomic masses of its isotopes.  

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its % abundance).  

Thus,  

0.7217 × 84.912   u =  61.282 u  

0.2783 × 86.909 u = 24.187  u  

                   TOTAL = 85.47   u  

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.