( ) [Xe]6s24f1
( ) 2s2
( ) 1s22s22p63s23p63d2
( ) [Ar]4s23d3
( ) [Kr]5s14d5
1) 6s2 4f1?
3) 1s2 2s2 2p6 3s2 3p6 3d2
Here is how you do this. I’ll do the first one or two.
#1. Count the electrons. I count 57. Look up element #57 and I see Lu. Go to http://www.webelements.com and click on Lu. Scroll down to electron shell properties, click on that, and see that the ground state for Lu is [Xe]5d1 6s2 and that makes [Xe]6s2 4f1 an excited state.
#2 is He and that is the ground state.
#3 is Ca.
I’ll be glad to check the others for you.
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