How Can You Tell an Element From Its Electron Configuration

Find the number of electrons (which will be the same as the atomic number of the element), so fill in the electrons in shells and sub shells co-ordinate to the filling rules.

If you want an electron configuration just in shells, then yous can employ the rules that shells fill from the nearest to the nucleus (n=1) out wards, and that the first shell can agree up to 2 electrons, so subsequent shells agree upwardly to 8 electrons. this works up to calcium (twenty electrons), after which we outset to see additional filling of the inner shell and it gets a bit more than complicated. And then, if we use these rules for phosphorus, which has xv electrons, then we get an electron configuration of [2,eight,5].

If we need subshell annotation, then we employ the filling lodge for the subshells in order of increasing energy of the subshell:

We demand to remember that s subshells can incorporate up to 2 electrons, p subshells can comprise upward to 6 electrons, and d subshells can contain upward to x electrons etc. In this way we can see that for scandium, with 21 electrons, the electron configuration volition be:
#1s^2 2s^2 2p^half dozen 3s^ii 3p^6 4s^two 3d^1#

Case

Write the electron configuration for magnesium.

Solution

Magnesium is element 12, and so it has 12 electrons.

When nosotros make full the subshells of Mg in order of increasing energy, we get the electron configuration #1s^two 2s^2 2p^half-dozen 3s^2# .

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Source: https://socratic.org/questions/how-do-you-find-the-electron-configuration-of-an-element

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