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Electronic configuration of the outer shell of the element Gd with atomic number 64 is
1) 4f4, 5d5 ,6s1
2) 4f3 ,5d5, 6s2
3) 4f5 ,5d4 ,6s2
4) 4f7, 5d1 ,6s2
4) 4f7, 5d1 ,6s2