The content that complies with is the problem of general keolistravelservices.comistry great 26. In this lecture we proceed the conversation of Quantum Numbers and their usage in Electron Configurations and the relationship of electron construction to the regular properties that the elements.

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Electron Configuration

Electron configurations are the review of whereby the electrons are roughly a nucleus. Together we learned earlier, every neutral atom has actually a number of electrons equal to its variety of protons. What we will do currently is place those electrons right into an arrangement about the cell nucleus that suggests their energy and also the form of the orbital in i m sorry they are located. Right here is a an introduction of the species of orbitals and how countless electrons each have the right to contain:


So based upon what we know about the quantum numbers and also using the graph above, you require 2 electron to to fill an s orbital, 6 electrons to fill a p orbital, 10 electron to fill a d orbital and 14 electrons to to fill the f orbital. But what we haven"t questioned is how these orbitals acquire filled...the stimulate of fill.

Order of Fill

The stimulate in which electron are placed into the orbitals is based on the order of your energy. This is described as the Aufbau principle. The lowest power orbitals to fill first. As with the quantum numbers themselves this bespeak was figured out by calculation and also is summarized by the following chart:


or you have the right to just usage the regular table:


How to compose an Electron Configuration

The symbols offered for writing the electron configuration start with the covering number (n) complied with by the form of orbital and also finally the superscript suggests how plenty of electrons are in the orbital.


For example:

Looking in ~ the regular table, you deserve to see that Oxygen has 8 electrons. Based upon the stimulate of to fill above, these 8 electrons would certainly fill in the following order 1s, 2s and then 2p. For this reason Oxygen"s electron configuration would certainly be O 1s22s22p4.

Special Cases

Configurations the ions existing a special instance of electron construction and also demonstrate the reason for the development of those ions in the first place.

If you should write the full electron construction for an anion, then you space just adding additional electrons and the construction is just continued.

For example, we know that Oxygen always forms 2- ions as soon as it makes an ion. This would add 2 electron to its common configuration do the brand-new configuration: O2- 1s22s22p6. V 10 electron you must note that oxygen"s electron construction is now precisely the very same as Neon"s. Us talked about the reality that ions type because they deserve to become more stable with the obtain or lose of electrons to become like the noble gases and also now you can actually see just how they come to be the same.

The electron configurations because that Cations are also made based upon the variety of electrons but there is a slight distinction in the method they space configured. Very first you must write their normal electron configuration and also then once you eliminate electrons you need to take them indigenous the outermost shell. Note that this is not constantly the same way they to be added.

Here is an example of what ns mean:

Iron has actually 26 electron so its normal electron configuration would be: Fe 1s22s22p63s23p64s23d6

When us make a 3+ ion because that Iron, we must take the electrons from the outermost shell first so that would certainly be the 4s shell NOT the 3d shell: Fe3+ 1s22s22p63s23p63d5

One other keep in mind on writing electron configurations: A brief cut. When writing several of the reduced table configurations the full configuration deserve to be reasonably long. In these cases, you deserve to use the previous noble gas to abbreviate the construction as presented below. Girlfriend just have actually to complete the construction from whereby the noble gas leaves it:



As through every various other topic we have covered to date there space exceptions to the stimulate of fill as well. But based upon the electron construction that room generated, this exceptions are straightforward to understand.

In the d block, particularly the groups containing Chromium and also Copper, over there is an exemption in exactly how they space filled.

Here are the yes, really configurations:


In these columns, the 4s and also 3d

Practice, Practice, Practice

There are several quizzes on electron configurations you can practice with situated here

Orbital Diagrams

Another means to represent the order of fill for one atom is by utilizing an orbit diagram regularly referred to as "the small boxes":


The box are provided to stand for the orbitals and also to display the electrons inserted in them. The order of to fill is the same yet as you can see from above the electrons are put singly right into the boxes before filling them v both electrons. This is dubbed Hund"s Rule: "Half fill before you full fill" and again this dominion was established based on energy calculations that shown that this was the way atoms actually distributed their electrons right into the orbitals.

Periodic Properties

One that the yes, really cool things around electron configuration is their relationship to the periodic table. Basically the periodic table was constructed so that aspects with comparable electron configurations would be aligned right into the same teams (columns).


Periodic Table showing last orbital filled because that each element

The routine table shown over demonstrates just how the configuration of each facet was set so that the critical orbital to fill is the same except for the shell. The reason this to be done is that the configuration of an facet gives the facet its nature and comparable configurations yield similar properties.

Let"s walk through some of the routine Properties that room influenced straight by the electron configuration:

Atomic Size

The dimension of atoms increases going down in the routine table. This need to be intuitive since with each heat of the table friend are adding a shell (n).

What is no as intuitive is why the dimension decreases indigenous left come right. However again the building of the electron configuration provides us the answer. What are you doing together you go across the periodic table? Answer, adding protons to the nucleus and adding electrons to the valence shell of the element. What is not transforming as you cross a period? Answer, the inner shell electrons.

So think of that this way, the inner covering electrons are a shield versus the traction of the nucleus. Together you overcome a duration and rise the number of protons in the cell nucleus you increase its traction but due to the fact that you space only adding electrons come the new shell the shield is not increasing however remains the same all the way across. This means the pull on the electrons being included to the valence covering is enhancing steadily all the method across. What wake up if you traction harder ~ above the electrons? Well, they come closer to the nucleus and also the dimension of the atom decreases. The effect of the cell core pulling ~ above the electrons gift added across a period is dubbed the efficient nuclear charge and also is calculated together ZEff = #protons - main point # Electrons.

So for instance the traction felt by Sulfur would certainly be ZEff = 16 - 10 = +6



Electronegativity may be the most important of the periodic properties you can learn and understand due to the fact that so many other nature are count on the value. Electronegativity is an atoms capability to traction electrons in the direction of itself.

Electronegativity is normally expressed by the Pauling Scale and the worths were identified experimentally. The table listed below shows the scale values because that the elements.


The electronegativity values boost from left come right and also bottom to peak in the periodic table excluding the Noble gases. The many electronegative facet is Fluorine.

From this electronegativity values we have the right to derive the trends of two other periodic properties: Ionization Energy and Electron Affinity.


Ionization Energy

Ionization power is the amount of power required to eliminate an electron from an atom. Every ionization energies are confident values because all of these removals (even those for aspects that form positive ions) require input that energy. The much more electronegative the element, the greater the ionization eneregy.

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Electron Affinity

The Electron Affinity that an aspect is the quantity of power gained or released v the enhancement of an electron. The electronegativity and also Electron Affinity rises in the very same pattern in the regular table. Left come right and also bottom come top.