| − | Electrons in d or f subshells which are outside the noble gas core.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref>
| + | '''Pseudocore''' [[electrons]] are those in ''d'' or ''f'' [[electron shell|subshells]] which are outside the [[noble gas]] core.<ref>http://antoine.frostburg.edu/chem/senese/101/electrons/glossary.shtml</ref> |