principles (aufbau, hund and bohr)

what is the Aufbau principle ( energy levels)

you must fill the lower energy level first before moving to a higher energy level

what is hunds rule

you must fill up orbitals with the same energy level one at a time, place electron on their own first not in pairs

bohr theory

• each orbit has a specific energy level

• electrons can only exist in those energy levels not in-between energy shells

• the shells are labelled n= 1,2,3…, n=1 is the lowest energy as it is the closest to the nucleus

what did bohrs theory say about electrons jumping between energy levels

• electrons can jump to a higher energy level if they absorb energy like heat or light

what is an example of bohrs theory

• the hydrogen atom

• hydrogen has 1 electron, and in bohrs model this elctron orbits the nucleus sin the n=1 energy level

• if it absorbs energy it can jump to n=2 eg

• but then it can fall back to n=1 if it releases the energy AS LIGHT