Which of the following is NOT one of the six methods known to force electrons from the valence ring of an atom?

The concept of forcing electrons from the valence ring of an atom involves various physical methods that can provide energy or promote movement of electrons. Among those methods, friction, pressure, and magnetism are established processes recognized within physics and materials science.

Friction generates heat through the interaction of surfaces, which can provide energy to overcome the binding forces of valence electrons. Pressure can affect the atomic structure and can compress materials in such a way that electrons may be more easily dislodged from their positions. Magnetism involves the influence of magnetic fields on the movement of charged particles, which can also encourage the movement of electrons from their atomic positions.

Transmission, however, does not fit into these established methods of dislodging electrons. It generally refers to the process of conveying information or energy through a medium, such as electrical signals through wires, rather than actively forcing electrons out of their atomic structure. Therefore, it is not recognized as a method for displacing electrons from the valence ring, making it the correct choice in this context.