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(i) The procedure of ejection of electrons from a metal surface by the application of heat is known as thermionic emission and emitted electrons are known as thermions and current flowing is known as thermion current.
(ii)Thermions have dissimilar velocities.
(iii)This was discovered by Edison
(B) COVALENT BOND: What about reactions between two non metals? Many non metals do bond together. Hydrogen atoms, for instance, frequently react with other hydrogen
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