General Chemisry question

[kov82]

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So on the topic of configurations, for Eu I put [xe] 6s^2 4f^6 5d^1 to get 63 without counting I would have only put [xe] 6s^2 4f^6 but one would be missing so I put that one on 5d^1 which was in the solutions book BUT it stipulated that the answer I got was "using only the periodic table" but that "the actual electron configurations are: Eu: [Xe] 6s^2 4f^7 " so what gives? which is correct on the DAT????? and does the pattern on "the actual configuartion" apply to all the f block elements? I can memorize a pattern but can someone explain why there are two different answers and which I should always use?????

 

[pbure9]

do you mean it would be 6s1 4f7

that makes more sense i think

actually, looked that up online and its what you said... hmm? dunno =/