Why do you think learning about how atomic theory has evolved is important?

Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter. It's just very important for us to learn and know new and current things because we will eventually need a answer for and to everything.

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.

You can still be friends with each other. you don't have to date since he likes someone else. just stick to being friends for now