An atom"s electron couchsurfingcook.comnfiguration explains the distribution of its electrons in the atomic orbitals ordered by the orbitals" energy levels. The easiest couchsurfingcook.comnfiguration is for Hydrogen: 1s1. The supermanuscript mirrors that there is one electron in the 1s orbital.

In the routine table beyond Helium (He), each element"s electron couchsurfingcook.comnfiguration is shown in an abbreviated develop that starts with the symbol of the noble gas that precedes it.

For instance, for Potassium (K) (atomic #19), the couchsurfingcook.comming before noble gas is Argon (Ar) (atomic #18). Thus, the couchsurfingcook.comnfiguration displayed for Potassium is 4s1 (check out Table below).

Potassium (K) atom has 19 electrons. The couchsurfingcook.commplete electron couchsurfingcook.comnfiguration of Potassium (K) is 1s22s22p63s23p64s1. The abbreviated develop - 4s1 - implies the electron couchsurfingcook.comnfiguration of Argon (Ar), plus one electron in the 4s orbital. Argon has 18 electrons. The one extra electron couchsurfingcook.comnfiguration couchsurfingcook.commpletes the picture for 19 electrons of Potassium.

You are watching: What is the electron configuration of argon

Keep in mind that in the electron couchsurfingcook.comnfiguration of both K and Ca, the 4s orbital is filled before the 3d orbital. The factor for this is that the power level of orbital 4s is slightly reduced than that of orbital 3d. Thus, orbital 4s is filled with electrons before orbital 3d.

Energy levels and sublevelsPrincipal power levelQuantum number: nSublevels availableQuantum number: l
1234561s2s 2p3s 3p 3d4s 4p 4d 4f5s 5p 5d 5f 5g6s 6p 6d 6f 6g 6h

Starting through Scandium (Sc, atomic #21), the 3d orbital has a lower energy than the 4s. Thus, the electron couchsurfingcook.comnfiguration of Sc is 3d1 4s2. For an explanation of these elements, view the reference by Schwarz provided below.

See more: Feynman Lectures On Physics Volume 1 Pdf, The Feynman Lectures On Physics Vol

The table listed below shows the abbreviated and also couchsurfingcook.commplete develops of the electron couchsurfingcook.comnfigurations of noble gases.

Electron couchsurfingcook.comnfigurations of noble gasesNo.AtomicweightNameSymbolGroupElectron couchsurfingcook.comnfigurationElectron couchsurfingcook.comnfiguration - Full
1020.180NeonNe18 2s2 2p61s22s22p6
1839.948ArgonAr18 3s2 3p61s22s22p63s2 3p6
3683.800KryptonKr18 3d10 4s2 4p61s22s22p63s2 3p63d10 4s2 4p6
54131.293XenonXe18 4d10 5s2 5p61s22s22p63s2 3p63d10 4s2 4p64d10 5s2 5p6
86222.000RadonRn18 4f14 5d10 6s2 6p61s22s22p63s2 3p63d10 4s2 4p64d10 5s2 5p64f14 5d10 6s2 6p6

Abbreviations and Definitions:

No. - Atomic number: The number of protons in an atom. Each element is uniquely defined by its atomic number.

Atomic mass: The mass of an atom is mainly identified by the variety of prolots and neutrons in its nucleus. Atomic mass is measured in Atomic Mass Units (amu) which are scaled loved one to carbon, 12C, that is taken as a standard facet with an atomic mass of 12. This isotope of carbon has 6 prolots and also 6 neutrons. Thus, each proton and also neutron has actually a mass of about 1 amu.


Schwarz E.W. The full story of the electron couchsurfingcook.comnfigurations of the change facets. Journal of Chemical Education (2010) 87(4) 444-448.

Also see: The Orbitron: A gallery of atomic orbitals and a few molecular orbitals

Home Search About couchsurfingcook.comntact