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Which of the following is a lanthanide ?(a) Curium (b) Californium(c) Erbium (d) Americium |
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Answer» Correct option (c) Erbium Explanation: The lantanide or lanthanoid is the series of chemicl elements. It comprises the fifteen metallic chemical elements with atomic number 57 through 71 from lanthanum lutetium. Erbium (z = 68) is a lanthanide while other three are actinide. |
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