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Speculate about why Mendeleev in 1869 placed Zn and Cd along with Be and Mg in a set of elements that we now

associate with Group2 in contemporary periodic tables ?

Why is it odd that the  IUPAC periodic table shows  the lanthanide  4f-transition series comprised of 15 elements from  Z=57(La) through Z=71(Lu) ?

 State one compelling  fundamental  reason for placing helium (He) as the first member of Group 2 ?

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