Electron affinity It is the amount of energy given out when an electron is added to a neutral gaseous atom. This results in the formation of an anion. For example Cl + e– → Cl + energy. The electron affinity of chlorine is 348 kJ mol-1. Electron affinity changes across a period. The electron affinity
De Broglie’s theory of wave nature of electrons: Electron, like light has dual character (particle and wave like) de Broglie suggested the wave nature of electrons and derived the relation λ = h/p where λ is the wavelength and p the momentum of the electron and h is Plank’s constant. This relation is verified by
Each atom is made up of an inner core called the nucleus. – Most of the atom’s mass is located in the relatively small nucleus. – The rest of the atom is comprised of a relatively large region outside the nucleus where the electrons are found. – The atom is made of 3 subatomic particles: