Electron configurations

Electron configura tions. Jelleane P. Taoatao Gr.12 GAS TIEMPO.

Elecetron configurations. What is electron configuration ? The electron configuration of an atom is the representation of the arrangement of electrons distributed among the orbital shells and subshells. Commonly, the electron configuration is used to describe the orbitals of an atom in its ground state, but it can also be used to represent an atom that has ionized into a cation or anion by compensating with the loss of or gain of electrons in their subsequent orbitals. Many of the physical and chemical properties of elements can be correlated to their unique electron configurations. The valence electrons, electrons in the outermost shell, are the determining factor for the unique chemistry of the element ..

What are Electron Configurations ?. The electron configuration of an element describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence. For example, the electron configuration of sodium is 1s 2 2s 2 2p 6 3s 1 ..

Electron configuration. An electron configuration describe the distribution of electron among the various orbitals in the atom. Electron represented in two days The SPDF NOTATION uses number to designate a principal shell and letters ( s,p,d,f) to identify a subshell; a superscript indicates the number of electrons in a designated subshell..

Electron Configurations In an orbital (box) diagram a box represents each orbital within subshells, and arrows represent electrons. The arrows' directions represent electron spins; opposing spins are paired. Is 2p Copyright O Pearson Prentice Hall, Inc..

RULES FOR ELECTRON CONFIGURATION Electrons ordinarily occupy orbitals of the lowest energy available. No two. Electron in the same atom may have all four quantum numbers alike. Pauli exclusion principle: one atomic orbital can accommodate no more than two electrons, and these electron must have opposing pins. Of a group of orbitals of identical energy, Electrons enter empty orbitals whenever possible ( HUND’S RULE) Electrons in half-filled orbitals have parallel spins( same direction).

Order of subshell energies.

abstract. Follow the arrows from the top: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, etc. Subshells that far from the nucleus may exhibits exceptions to the filling order.

Valence electrons and core elements. The valence shell is the outer most occupied principal shell. The valence shell contains the VALENCE ELECTRONS. For main group elements, the number of valence shell electrons is the same as the periodic table group number (2A elements: two valence electron , etc.) The period number is the same as the principal quantum number n of the electrons in the valence shell Electrons in inner shells are called cored electron..