Consider the element with the electron configuration [Xe]6s²4f⁷. This element is A) a halogen. B) a lanthanide element. C) a nonmetal. D) an actinide element. E) a noble gas.

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The electron configuration [Xe]6s²4f⁷ corresponds to a lanthanide element, specifically europium (Eu), which is part of the lanthanide series.

Consider the Element with the Electron Configuration [Xe]6s24f7

Consider the Element with the Electron Configuration [Xe]6s²4f⁷