EL 3
- Shell 1 holds 2 electrons n=1
- Shell 2 holds 8 electrons n=2
- Shell 3 can hold 18 electrons n=3
- Shell 4 can hold 32 electrons n=4
==These shells contains different types of sub-shells with have different numbers of orbitals and each orbital can hold up to 2 electrons== - n=1 shell contains just the 3 sub-shell
- n=2 contains an s and p sub-shell
- n=3 contains an s, p, and d sub-shell
- n=4 contains an s, p, d and f sub-shell
==orbital== = the bit of space an electron is most likely to be found in . the electrons in each orbital spin in opposite directions - there is 1 s orbital so it contains 2 electrons
- there are 3 p orbitals so each p sub-shell can carry 6 electrons
- there are 5 d orbitals so the d subshell can carry 10 electrons
- there are 7 f orbitals so the f sub-shell can carry 14 electrons
==the electrons shell are filled with the lowest energy level first- here is the order== - 1s 2s 2p 3s 3p 4s 3d 4p
You can use noble gas symbols in electron configurations to replace writing out all the occupied energy levels - Eg. [Ar] 4s^2 would be calcium
==Ion === a charged particle - A dull outer shell of electron shas a mosre stable electron arrangement so elements lose or gain electrons to get a complete outer shell