electron configurations, Chemistry

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what is the unabbreviated electron configuration of lanthanum

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Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is: (1) 4 Π mr 2 / nh         (2)  nh/ 4Π 2 mr          (3) nh/ 4Π 2 mr 2

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why lanthanide series is called lanthanide?

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