The outer (valence) covering is fully filled through all possible electrons, making it very stable and nonreactive.
You are watching: Which of the following is true about the electron configurations of the noble gases
Electron configuration is just the description of how numerous electrons room in each orbital. Elements are “built up” through the enhancement of protons and electrons in a constant sequence that we portray together the routine Table.
The “noble gases” were referred to as that in historic chemistry due to the fact that of their stability – they execute not react conveniently with various other compounds. This is because their outer (valence) electron covering or orbital is totally filled, make it really stable. That neither wants to give up an electron nor take much more on, as in each instance it takes much more energy to do that than to remain in its normal state.
Other facets in their regular state contain unfilled orbitals in your valence shell, making lock react through other an ideal elements to kind more energetically steady compounds. Starting from the “ground state” (normal condition) of any element we deserve to determine whether adding or acquisition away electron will an ext quickly bring it come a more stable state.
See more: How Many Electrons Does Antimony Have, Sb Antimony
Dec 10, 2016
It"s basically a shorthand, to help you keep your electron construction from acquiring too long.
To highlight this, let"s shot an example:
Write the electron construction of Selenium, Se.
Answer: #1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^4#
That is nice long! and also especially as you keep doing many these examples, you"ll discover that you have to write several the exact same things again and again. So, to save time, here"s what us do. We substitute in the nearest noble gas for many of the configuration. Let me present you just how this works:
This chart depicts whatever you"ll be composing in the initial electron configuration of Selenium above:
Now, if we take into account the construction of the Noble Gas closest come Selenium - Argon - here"s what us have:
So as you can see, what we"re act is we"re substituting in the Noble Gas"s Electron construction for most of the actual element"s electron configuration.
Now, let"s create the electron configuration of Selenium v Noble Gas electron configuration:
Notice just how we conserved a lot of space with that. This will help you conserve some time as soon as writing out configurations, especially if you need to do many of them.
As because that ones with ions, that"s simply a matter of including or subtracting based upon the number of electrons lost/gained. So, because that example, if you had a +2 ion, then ask yourself: have I shed or gained electrons? In this case, you"ve shed 2 electrons. This method that you"d take it the initial electron configuration of that element, and subtract 2 electrons.