Lanthanoid

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Lanthanoid [r]: The group of f-block chemical elements with atomic numbers between 58 (cerium) and 71 (lutetium); named after lanthanum, which immediately precedes the series. [e]

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Atomic No. 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
Name La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
M3+ f electrons 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14