ABSTRACT
According to the long-inherited cosmological view of the Orient, the universe consists of yin (−) and yang (+) (1). They refer to entities that are richer in “negative spirits” and their counterparts that are richer in “positive spirits.” The knowledge of chemistry that has been accumulated during the last two centuries has also verified that matter consists of the two: those that are richer in negative-charge density and their counterparts that are richer in positive-charge density. In other words, matter consists of the two that are richer and poorer, respectively, in electron density. Accordingly, matter now can be categorized as electron richer or electron poorer. Consistent with this, in chemistry, compounds have commonly been divided into bases and acids, nucleophiles and electrophiles, and reductants and oxidants (2).
