Second: KNOW YOUR ORBITALSKnow just how many kind of electrons each orbital deserve to host and also their order.(Refer to the complying with images as notes)
Third: Write out the electron configuration
For Krypton and many of the elements there are even more the just one method (typically two) to write the electron configuration. One means is to create out the entire electron configuration by going via each orbital or we deserve to usage a shorthand notation using the noble gases as a starting suggest. I will certainly go through both methods:
First Method: (Long way)
We understand that Krypton has actually #36# electrons.
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We know that the #s,p,d# orbital deserve to host a max of #2,6,10# electrons respectively. Using this as a guide and also going with 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#
2nd Method (Shorthand)
The crucial to utilizing this approach is to identify the noble gas closest to the wanted aspect that is at a reduced energy (Has a lower atomic number if I"m loosely speaking). In essence, the shorthand notation tells us the configuration by using a noble gas element as our founding allude rather of beginning all the way at the #1s# orbital. This strategy becomes really helpful for facets that have actually the majority of electrons like Krypton because it becomes a hassle to write out such a long electron configuration.
Coincidently, Krypton itself is a noble gas so we might write the electron configuration as #<"Kr">#. But we might likewise write out the configuration beginning making use of #"Ar"# given that it is the closest noble gas through the lower power. From tbelow we compose out the continuing to be configuration favor we did in the first technique.
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The finish result would certainly then be: *#<"Ar"> 4s^2 3d^10 4p^6#
*Notice just how the configuration #1s^(2)2s^2 2p^6 3s^2 3p^6# is the electron configuration for #"Ar"# so by founding with #"Ar"# we indicate that it is the configuration of whatever that came prior to. In essence, #"Ar"# is just a representation for #1s^(2)2s^2 2p^6 3s^2 3p^6# without us having to compose it all out.
All in all, the three offered answers are correct methods of figuring out the ground-state electron configuration of Krypton .