Second: know YOUR ORBITALSKnow how many electrons every orbital deserve to hold and their order.(Refer to the adhering to pictures as notes)



Third: create out the electron configuration

For Krypton and most of the aspects there are much more the simply one way (usually two) to write the electron configuration. One method is to create out the whole electron configuration by going with each orbital or we have the right to use a shorthand notation using the noble gases as a beginning point. I will certainly go v both methods:

First Method: (Long way)

We recognize that Krypton has #36# electrons.

You are watching: How many core electrons does krypton have

We recognize that the #s,p,d# orbital have the right to hold a max that #2,6,10# electrons respectively. Making use of this as a guide and also going v the regular table we discover the electron configuration to be:

#1s^(2)2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6#

Second an approach (Shorthand)

The vital to using this technique is to identify the noble gas closest come the desired aspect that is at a lower energy (Has a reduced atomic number if I"m loose speaking). In essence, the shorthand notation tells us the construction by using a noble gas aspect as our beginning point instead of beginning all the method at the #1s# orbital. This technique becomes really advantageous for facets that have actually a lot of electrons like Krypton because it becomes a problem to create out together a lengthy electron configuration.

Coincidently, Krypton itself is a noble gas so we could write the electron configuration together #<"Kr">#. Yet we could also write the end the configuration start using #"Ar"# due to the fact that it is the closest noble gas v the reduced energy. From there we compose out the remaining configuration favor we walk in the very first method.

See more: How Many Pounds In 67 Kg Is How Many Pounds In 67 Kg? Convert 67 Kilograms To Pounds

The end result would climate be: *#<"Ar"> 4s^2 3d^10 4p^6#

*Notice how the construction #1s^(2)2s^2 2p^6 3s^2 3p^6# is the electron configuration for #"Ar"# therefore by beginning with #"Ar"# we indicate that it is the configuration of everything that come before. In essence, #"Ar"# is simply a depiction for #1s^(2)2s^2 2p^6 3s^2 3p^6# without us having to write it every out.

All in all, the three given answers are correct methods of figuring the end the ground-state electron configuration of Krypton .