THESE lectures deal with the development of the theory of valency from its origin to the latest quantum-mechanical views on the subject. The subject is discussed concisely, but the exposition is clear ...

THERE is an increasing tendency on the part of organic chemists to apply the Berzelius dualistic theory, in a modified form, to organic compounds. In many theories of valency, individual groups are ...

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.