exclusion principle

views updated Jun 11 2018

exclusion principle Basic law of quantum mechanics, proposed by Wolfgang Pauli in 1925, stating no two electrons in an atom can possess the same energy and spin. More precisely, the set of four quantum numbers characterizing certain elementary particles called fermions must be unique.

exclusion principle

views updated May 17 2018

exclusion principle A principle introduced in 1934 by the Russian ecologist G. F.Gause (1910–86), that two species cannot coexist in the same locality if they have identical ecological requirements.

exclusion principle

views updated Jun 27 2018

exclusion principle See COMPETITIVE-EXCLUSION PRINCIPLE.

exclusion principle

views updated Jun 11 2018

exclusion principle A principle, introduced by G. F. Gause, that two species cannot coexist in the same locality if they have identical ecological requirements.