An electron shell is the outside component of one atom approximately the atom nucleus. It is a group of atom orbitals v the very same value that the primary quantum number (n). Electron shells have one or an ext electron subshells, or sublevels. The surname for electron shells originates from the Bohr model, in which groups of electron were thought to go roughly the nucleus at certain distances, so the their orbits created "shells".

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What more could we want to know around the framework of one atom? We know that atom contain positively and negatively fee particles, and also that the number of these charges in every atom is different for every element. We likewise know the the positive charges are concentrated in a small nucleus, and also that the electrons move approximately the cell core in a an are that is much, much larger than the nucleus.

However, some of the most important questions we asked in the vault Concept advance Study room still unanswered. Remember the we experienced that carbon and nitrogen have very comparable atomic masses. Currently we can add that these elements have very similar atomic numbers, so their atoms have comparable numbers that protons and also electrons. But carbon and also nitrogen are, in many benidormclubdeportivo.orgical and also physical ways, very different. Similarly, some facets like sodium and potassium have very different atomic numbers yet have quite similar benidormclubdeportivo.orgical and physical properties. It appears that to compare the properties of two different atoms is not very easy come understand just from to compare the numbers of protons and also electrons the atoms contain.

To proceed to know the answer to these questions, we need even more detail about the framework of each kind of atom. Understanding of the electron configuration of various atoms is useful in understanding the structure of the regular table of elements. The ide is additionally useful because that describing the benidormclubdeportivo.orgical bonds that organize atoms together.


An electron shell might be believed of together an orbit followed by electrons about an atom nucleus. Since each shell can contain only a fixed number of electrons, each covering is associated with a particular range the electron energy, and also thus every shell should fill totally before electrons can be added to an outer shell. The electrons in the outermost shell recognize the benidormclubdeportivo.orgistry properties the the atom (see Valence shell). For an explanation the why electron exist in this shells see electron configuration.

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Figure (PageIndex1): A covering Diagram of lithium (left) and also Sodium (right)

The electron shells space labeled K, L, M, N, O, P, and also Q; or 1, 2, 3, 4, 5, 6, and also 7; going native innermost covering outwards. Electron in outer shells have greater average energy and travel farther from the nucleus than those in inside shells. This renders them an ext important in determining how the atom reacts benidormclubdeportivo.orgically and behaves together a conductor, due to the fact that the pull of the atom"s cell nucleus upon them is weaker and an ext easily broken. In this way, a given element"s reactivity is extremely dependent top top its electronic configuration.