idea of electron shells

Elementary Idea of Electron Microscope - In optical microscope, the ray of light can be bent by a lens system. By placing the object and the lens system in such a way, we control the direction of the ray to get a magnified image of the object. Since as 'electron' carri..

In optical microscope, the ray of light can be bent by a lens system. By placing the object and the lens system in such a way, we control the direction of the ray to get a magnified image of the objec..

The outermost shell of an atom is called its Valence shell. It is the decisive shell during a chemical reactio..

The VSEPR theory, proposed by R.J.Gillespie and R.S. Nyholmm in 1957, is based on the repulsions between the electron-pairs in the valence-shell of the atoms in the molecule. It was developed to predict the shapes of the molecules in which the atoms are bonded together with sing..

Group I A elements Electronic configuration No.of elememnts Hydrogen 1 1 Lithium 2,1 2 Sodium 2,8,1 3 Potassium 2,8,8,1 4 Rubidium 2,8,18,8,1 5 Caesium 2,8,18,18,8,1 6 Francium 2,8,18,32,18,8,1 7 ..

The outermost shell of an atom is known as the valence shell. The electrons present in the valence shell are called valence electrons..

The outermost shell of an atom is known as the valence shell. The electrons present in the valence shell are called valence electrons. K L M Na - 11 - 2 8 1 Valence shell - M Valence electrons - 1 Core electrons - 2 + 8..

Group 2 elements are called alkaline Earth metals. These elements have two electrons in the valence shell of their atoms, preceded by the noble gas configuration. Their general configuration is written as [Noble gas] ns 2 where 'n' represents the valence shell..

Certain electronic configuration like half-filled and completely-filled shells have extra stability. It is more difficult to remove electron from these stable configuration and the ionization energy is very high. For example, the noble gases have the most stable confi..

Both hydrogen and alkali metals have one electron each in their valence shell. For example, H (Z=1) : 1s 1 Li (Z=3) : [He] 2s ..