There's been an unsolved mystery associated with mixed valence compounds: when the valence state of an element in these compounds changes with increased temperature, the number of electrons associated ...

The concept of "valence" - the ability of a particular atom to combine with other atoms by exchanging electrons - is one of the cornerstones of modern chemistry and solid-state physics. Valence ...

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 ...