photoelectric effect and electron

When light of sufficiently small wavelength is incident on a metal surface, electrons are ejected from the metal. This phenomenon is called as 'photoelectric effect' and the ejected electrons are called as 'photoelectrons..

There are three ways in which electrons eject out of a material. They are (i) Thermionic emission (ii) Field emission (iii) Photo electric emission In all the above cases, energy is given to the material but in different forms. If given in the form of heat it is called as Thermionic emiss..

Dual Nature of Radiation and Matter..

The 's' electrons are more penetrating (maximum probability of finding near the nucleus) towards the nucleus than the p electrons. The order of penetration power in a given shell is s > p > d > f If the penetration power of the electron is more, it will be cl..

The effects of resonance is prominent in conjugated systems (having alternate single and double bonds) wherein displacements of electrons from one part of the molecule to another part takes place, creating centers of high and low electron densit..

This is a temporary effect and takes place between two atoms joined by a multiple bond, i.e., a double or triple bond. It occurs at the requirements of the attacking reagent, and involves instantaneous transfer of a shared pair of electrons of the multiple bond to one of the lin..

The adverse effects of particulates on materials include damages to electronic equipment through chemical or mechanical action on electrical contacts, erosion and soiling of buildings, sculptures and painted surfaces. Corrosion of metals (when the atmosphere is humid) also take..

There is delocalisation of electrons in haloarenes due to resonance. For example, chlorobenzene is considered to be a resonance hybrid of the following structures:..

(i) All these have maximum electron affinities in their respective periods. This is due to the fact that the atoms of these elements have only one electron less than the stable noble gas (ns 2 np 6 ) configurations. Therefore, may have maximum tendency to accept an additional h..

.79 which is higher than that of iodine i.e., 3.28. Hence, chlorine accepts the electrons more easily than iodine. Electron affinity increases from left to right across the period because of increase in nuclear charge and decrease in atomic size. This causes the incoming el..