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Why the electronic configuration of samarium is ending with 4f⁶6s²

In the f-block elements is more stable to have a d1 orbital at the f7's next element (for instance, gadolinium, which has 6s2 4f7 5d1) than having the previous one with s1 configuration.
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Electronic configuration in d-block

Writing 6s orbital at end of electronic configuration indicates that electron will first be removed from 6s orbital then 5d then 4f. d blocks are exceptional casses. That's why they behave like that. ...
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Electronic configuration in d-block

It doesn't matter the way you write it. 4f 5d 6s is the same as 6s 4f 5d. The first one is ordered by energy and the second by the way the orbitals are filled. Even though, you must note that the 5d${^...
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Fundamental doubts about energy levels vs. shells vs. subshells vs. orbitals

Shell, level and orbital can often be used interchangeably although they do have different meanings. The level represents an ordinal or numerical representation of the state and corresponding relative ...
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Are there any monocations with negative electron affinities known?

You are talking about superalkalis, which are defined as groups of atoms that have a lower ionization energy than any alkali metal atom -- that limit being about 3.9 eV for caesium. ("Pseudo-...
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Are there any monocations with negative electron affinities known?

A monocation with an endothermic (negative) electron affinity is the same as a neutral species with an exothermic (negative) ionization energy. Reframing it this way may turn up more information. The ...
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