Bromine Storybook Page 2
Storyboard Text
- Slide: 1
- Firstly, about the Aufbau principle, it stated that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy level before occupying higher-energy levels
- Slide: 2
- On the board are pictures about Aufbau principle, in whichelectrons are presented in order of energy levels from low to high, thisis the reason why when Bromineanswered his electron configuration, he arranged it from 1s to 4p
- Slide: 3
- While the Pauli Exclusion principle defines that a maximum of two electrons, each having opposite spins, can fit in an orbital
- Now, move on to Hund's rule and Pauli Exclusion principle. Hund's rule states that every orbital in a given subshell is singly occupied by electronsbefore a second electronis filled in an orbital
- Slide: 5
- As you can see, on the board is anenergy level diagram of the electron configuration of Bromine. Based on the Hund's rule and the Pauli Exclusion principle that we just learned, this can explain why Bromine has to fill up the required number of electrons for each subshell before moving to the next
- For example, he saidinstead of before moving to because the subshell dcan hold a maximum of 10 electrons
- Slide: 6
- One thing to note, look at the diagram on the board, you can see that following to Pauli's Exclusion principle, in eachorbital occupied by 2 electrons, one electron will spin up and the other will spin down
- Slide: 7
- One special thing is that the electron configuration is divided into two states,one is the ground state as Bromine said and the other is the excited state
- The ground state configuration is the lowest energy, most stable arrangement. While excited state configuration is a higher energy arrangement but it requires energy input to created
- Slide: 8
- Excited state can have many cases depending on the amount of energy absorbed by the atom. So Bromine, can you give an example of your electron configuration in excited state?
- Slide: 9
- Yes, sir, an example I choose is that when I absorb energy from a photon, one of my electrons can move from the 4p orbital to the 5s orbital, which means promoted from a lowerto a higher energy orbital
- My electron configuration in this excited state could now be written as
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