Writing+electron+configurations+of+atoms+in+full+and+core+notation

Definations:
** In chemistry, __electron configuration__ is ** **the arrangement of electrons of an atom, or other physical structure. It concerns the way electrons can be distributed in the orbitals of the given atom.** __Core notation__ of an atom use the core of the atom to show its stracture.** (The Core of the atom is the noble gas that comes before it on the period table.)
 * __Full notation__ of an atom is the way to show the stracture of the atom by showing all its orbitals.

__[|A useful Periodic Table](link)__ order for filling the orbitals: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, and 7p

you can click on the pictures.

EXAMPLES: Full Notation C = 1s22s22p2 Core Notation C = [He]2s22p2

NOTICE The most stable arrangement of electrons is that with the maximum number of unpaired electrons, all with the same spin direction. (One electron goes in a orbital at a time before doubling up)


 * Cr || **we would predict:** 1s2 2s2 2p6 3s2 3p6 4s2 3d4 **but it is actually -->** || 1s2 2s2 2p6 3s2 3p6 4s13d5 ||
 * Cu || **we would predict:** 1s2 2s2 2p6 3s2 3p6 4s2 3d9 **but it is actually -->** || 1s2 2s2 2p6 3s2 3p6 4s1 3d10 ||

**Notice that 4s fills before 3d, which fills before 4p orbital – refer to the periodic table above Full Notation Core Notation** P (1s2 2s2 2p6 3s2 3p3 ) P ([Ne] 3s2 3p3 ) Ti (1s2 2s2 2p6 3s2 3p6 4s2 3d2 ) Ti ([Ar] 4s2 3d2 ) Co (1s2 2s2 2p6 3s2 3p6 4s2 3d7 ) Co ([Ar] 4s2 3d7 ) Br (1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 ) Br ([Ar] 4s2 3d10 4p5 ) Sr (1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 ) Sr ([Kr] 5s2 )
 * More Examples: **