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What is the full electron configuration of Lanthanum?
(A): 1s22s22p63s23p63d104s24p64d105s25p65d26s1 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 5s^{2} 5p^{6} 5d^{2} 6s^{1} 1s22s22p63s23p63d104s24p64d105s25p65d26s1
(B): 1s22s22p63s23p63d104s24p64d105s25p65d16s2 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 5s^{2} 5p^{6} 5d^{1} 6s^{2} 1s22s22p63s23p63d104s24p64d105s25p65d16s2
(C): 1s22s22p63s23p63d104s24p64d104f15s25p66s2 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 4f^{1} 5s^{2} 5p^{6} 6s^{2} 1s22s22p63s23p63d104s24p64d104f15s25p66s2
(D): 1s22s22p63s23p63d104s24p64d105s25p65d31s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 4d^{10} 5s^{2} 5p^{6} 5d^{3} 1s22s22p63s23p63d104s24p64d105s25p65d3
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