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These are two groups of what are called "inner transition elements" because the differentiating electron that is in one of the group but not in the one with the next lower atomic number goes into an f orbital, even though the atom already contains all of its valence electrons in its s and p orbitals
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∙ 12y ago
Wiki User
∙ 14y agoThe Lanthanide and Actinide series are at the bottom of the Periodic Table of elements because if they were where they were supposed to be, then the table would be way too long. The Lanthanide series actually goes between Lanthanum and Hafnium, and the Actinide series goes between Actinium and Rutherfordium.
Wiki User
∙ 14y agoActinides:
Actinium (Ac), Thorium (Th), Protactinium (Pa), Uranium (U), Neptunium (Np), Plutonium (Pu), Americium (Am), Curium (Cm), Berkelium (Bk), Californium (Cf), Einsteinium (Es), Fermium (Fm), Mendelevium (Md), Nobelium(No), Lawrencium(Lr).
Lanthanides:
Lanthanum (La), Cerium (Ce), Praeseodymium(Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium(Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb), Lutetium (Lu).
Wiki User
∙ 13y agoAnother name for the lanthanides and actinides is Rare Earth Metals. Although this is somewhat misleading because some of them (like Eisteinium) are synthetic.
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∙ 11y agoThese together are known as the f-block elements.
Wiki User
∙ 11y agoAnother name for the lanthanides are the rare earths
Wiki User
∙ 13y agoinner transition metals
Wiki User
∙ 11y agoinner transition metals
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