Noble Gas Configuration Of Aluminum
5.20: Noble Gas Configuration
- Folio ID
- 52978
How does it feel to exist full later on a meal?
Envision that you take nearly finished a groovy meal, but cannot put another bite in your mouth because in that location is no place for information technology to go. The noble gases take the same trouble—in that location is no room for any more electrons in their outer shells. They are completely full and cannot handle any more.
Noble gas Configuration
Sodium, element number 11, is the showtime element in the 3rd menses of the periodic tabular array. Its electron configuration is \(1s^2 2s^ii 2p^6 3s^ane\). The first ten electrons of the sodium atom are the inner-shell electrons and the configuration of just those ten electrons is exactly the same equally the configuration of the element neon \(\left( Z=10 \correct)\). This provides the basis for a autograph notation for electron configurations called the noble gas configuration. The elements that are found in the last column of the periodic tabular array are an of import group of elements called the noble gases. They are helium, neon, argon, krypton, xenon, and radon. A element of group 0 configuration of an atom consists of the elemental symbol of the terminal element of group 0 prior to that atom, followed by the configuration of the remaining electrons. So for sodium, we make the commutation of \(\left[ \ce{Ne} \right]\) for the \(1s^ii 2s^2 2p^6\) part of the configuration. Sodium'southward noble gas configuration becomes \(\left[ \ce{Ne} \right] 3s^1\). Table \(\PageIndex{1}\) shows the noble gas configurations of the 3rd period elements.
| Element Name | Symbol | Atomic Number | Noble Gas Electron Configuration |
|---|---|---|---|
| Sodium | \(\ce{Na}\) | eleven | \(\left[ \ce{Ne} \right] 3s^1\) |
| Magnesium | \(\ce{Mg}\) | 12 | \(\left[ \ce{Ne} \correct] 3s^2\) |
| Aluminum | \(\ce{Al}\) | 13 | \(\left[ \ce{Ne} \right] 3s^2 3p^1\) |
| Silicon | \(\ce{Si}\) | 14 | \(\left[ \ce{Ne} \correct] 3s^2 3p^two\) |
| Phosphorus | \(\ce{P}\) | 15 | \(\left[ \ce{Ne} \right] 3s^two 3p^3\) |
| Sulfur | \(\ce{Due south}\) | sixteen | \(\left[ \ce{Ne} \right] 3s^two 3p^4\) |
| Chlorine | \(\ce{Cl}\) | 17 | \(\left[ \ce{Ne} \correct] 3s^2 3p^v\) |
| Argon | \(\ce{Ar}\) | 18 | \(\left[ \ce{Ne} \right] 3s^2 3p^6\) |
Again, the number of valence electrons increases from ane to eight across the 3rd period.
The fourth and subsequent periods follow the same pattern, except for the use of a dissimilar noble gas. Potassium has nineteen electrons, 1 more than the noble gas argon, and then its configuration could be written as \(\left[ \ce{Ar} \right] 4s^1\). In a similar manner, strontium has ii more electrons than the noble gas krypton, which would let us to write its electron configuration as \(\left[ \ce{Kr} \right] 5s^2\). All elements tin be represented in this manner.
Summary
- The noble gas configuration organization allows some shortening of the total electron configuration by using the symbol for the noble gas of the previous period every bit office of the pattern of electrons.
Review
- What is the element represented by \(\left[ \ce{Ne} \right] 3s^2 3p^2\)?
- What element has this electron configuration \(\left[ \ce{Ar} \right] 3d^vii 4s^2\)?
- What element of group 0 would be part of the electron configuration note for Mn?
- How would you write the electron configuration for Ba?
Noble Gas Configuration Of Aluminum,
Source: https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/05%3A_Electrons_in_Atoms/5.20%3A_Noble_Gas_Configuration
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