why lanthanoids elements with even atomic number are relatively more abundant and also have a large number of isotopes than elements with odd atomic number
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because lanthanides with even atomic number can exist in +3 o.s which is most stable for lanthanides
1Dishu1:
the most common oxidation state of lanthanoids is +3 .ex Pm - atomic number -61 odd and oxidation state is 3
so your answer is not completely correct
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