Electron Configuration for Sr

The electron configuration for Sr is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2. Strontium has 38 electrons distributed among its orbitals.

Strontium is a chemical element with the symbol Sr and atomic number 38. It is a silvery-white metal that belongs to the alkaline earth metals group. Strontium is widely used in fireworks, flares, and pyrotechnics due to its bright red color.

It is also used in certain medicines to treat bone disorders. The electron configuration of an atom helps to determine its chemical and physical properties, and the configuration of strontium is relatively stable due to the filled d and s orbitals. This stability makes it valuable for use in nuclear radiation detectors and in the production of ferrite magnets.

The Notations Used In Electron Configuration

The electron configuration for Sr, or strontium, is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s². The notations used in electron configuration describe the organization of electrons in shells and subshells within an atom. Understanding electron configuration is essential in predicting chemical behavior and reactivity.

When studying electron configuration, we use various notations to represent the number of electrons in each energy level and sub-level of an atom. The notation system used depends on the context and purpose of the study. We will discuss two primary notations, orbital notation and spectral notation, used in describing the electron configuration for Strontium (Sr).

Orbital Notation

Orbital notation is a type of notation used by chemists to represent the electronic configuration of an atom. In this notation, sublevels are represented by a box with arrows indicating the electron’s spin. Moreover, the orbitals are supposed to be filled in the order of increasing energy level as per the Aufbau Principle. For Strontium, we know that it has 38 electrons in its atom. Therefore, we can use orbital notation to represent its electron configuration as follows:

  • 1s22s22p63s23p64s23d104p65s2
  • Orbital Notation: [ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ] [ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ] [ ↑↓ ↑↓ ↑↓ ] [ ↑↓ ↑↓ ↑↓ ] [ ↑↓ ↑↓ ]

This notation highlights the arrangement, filling, and relative energies of the sublevels.

Spectral Notation

Spectral notation is another type of notation used in representing electron configuration. It describes the atoms’ electron distributions by identifying the energy levels and the number of electrons that are in them. In this notation, the levels are represented by numbers (1, 2, 3…), and a letter code designates the sub-energy levels (s, p, d, f). For Strontium, we can use spectral notation to represent its electron configuration as follows:

Level Sub-level Number of Electrons
1 s 2
2 s 2
  p 6
3 s 2
  p 6
  d 10
4 s 2
  p 6
5 s 2

Spectral notation concentrates more on just the count and position of each electron instead of the order of arrangement and energy level of the sublevels. Therefore, it isn’t as detailed as the orbital notation.


Step By Step Guide To Finding Electron Configuration Of Sr

To find the electron configuration of Sr, start by determining the number of electrons in Sr, which is 38. Then, follow the Aufbau principle, filling orbitals in increasing order of energy levels. The electron configuration of Sr is 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s².

Electron configuration is a crucial topic in chemistry that plays a critical role in understanding the periodic table. It is necessary for students and professionals in the field to master the concept of finding an element’s electron configuration. In this guide, we will focus on the step-by-step process of finding the electron configuration of Strontium (Sr).

Identifying The Atomic Number Of Sr

The first step in finding the electron configuration of Sr is to identify its atomic number, which is 38. Remember that an atomic number is the number of protons in an atom. Therefore, the atomic number of an atom determines its position in the periodic table.

Determine The Configuration Of Previous Noble Gas

The next step is to determine the configuration of the previous noble gas, which in this case is argon (Ar). The electron configuration of Ar is 1s2 2s2 2p6 3s2 3p6, which means it has 18 electrons. Since Sr has 38 electrons, we can subtract 18 from 38, giving us 20.

Establish The Remaining Configuration Of Sr

The final step is to establish the remaining configuration of Sr. We add the 20 electrons to the electron configuration of the previous noble gas (Ar) to get 1s2 2s2 2p6 3s2 3p6 4s2. Therefore, the electron configuration of Strontium (Sr) is 1s2 2s2 2p6 3s2 3p6 4s2. In conclusion, by following these three simple steps, you can easily find the electron configuration of Strontium. Remember that electron configuration is an essential concept in chemistry and mastering it is vital for both students and professionals in the field.

Shortcuts To Determine Electron Configuration Of Sr

The electron configuration of Sr can be determined quickly through shortcuts. By knowing the atomic number and using the noble gas notation, you can easily identify the number of electrons in each shell.

Sr has 38 electrons in total, and determining its electron configuration can be tedious. However, there are two shortcuts: using noble gas core notation and using condensed configuration.

Using Noble Gas Core Notation

Noble gases have complete electron shells, making them stable. Sr’s electron configuration starts with the noble gas core of [Kr] (Krypton). The remaining 18 electrons of Sr can be added after the noble gas core notation.

Electron Configuration using Noble Gas core Notation:

Noble Gas Core Notation Number of Electrons
[Kr] 38

Using Condensed Configuration

The condensed configuration lists the symbol of the previous noble gas in square brackets followed by the electron configuration of the element from the preceding noble gas until the element being described. For Sr, the preceding element is calcium [Ar].

Electron Configuration using Condensed Configuration:

Condensed Configuration
[Ar] 4s2 3d10 4p6

Exceptions To Electron Configurations

The electron configuration for Sr does not follow the expected pattern due to its valence electron configuration. Even though Sr belongs to the same group as Ca and Ba, it has a different electron configuration due to the presence of a filled d-sublevel.

Electron configurations detail the arrangement of electrons around an atom’s nucleus. In most cases, electron configurations follow specific patterns determined by the periodic table. However, there are a few exceptions to these patterns, where electrons occupy slightly different orbitals than expected.

Chromium (cr)

Chromium has an atomic number of 24, which means it has 24 electrons. As per the expected electron configuration pattern, Cr should have a full 3d orbital and half-filled 4s orbital. However, in reality, Chromium’s electron configuration ends up being [Ar] 3d5 4s1. The reason behind this exception is the increased stability gained by having a half-filled d sublevel.

Copper (cu)

[Ar] 3d9 4s2. However, it deviates from the pattern due to the increased stability gained by having a full d sublevel. Therefore, copper’s electron configuration is [Ar] 3d10 4s1. These exceptions to electron configurations are crucial to understand because they help to explain some chemical properties and behavior in different elements. In conclusion, these exceptions remind us that science is not always predictable and has room for variation. Understanding the unique electron configuration of each element is fundamental in explaining their chemical properties and interactions.

Frequently Asked Questions Of Electron Configuration For Sr

How Do You Write The Electronic Configuration Of Sr?

The electronic configuration of SR is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2.

What Is The Electronic Configuration Of The Element 56?

The electronic configuration of element 56, which is known as barium (Ba), is 2-8-18-18-8.

What Is The Condensed Noble Gas Electron Configuration Of Sr?

The condensed noble gas electron configuration of Sr is [Kr]5s².

What Is Electronic Configuration Of 39?

The electronic configuration of 39 is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹.


To conclude, understanding the electron configuration of Sr is critical in predicting its chemical behavior and properties. The electron configuration of 1s22s22p63s23p64s23d104p65s2 is a significant factor for Sr, affecting its reactivity and bonding ability. With this information, chemists can predict the reactions Sr will undergo to form more complex compounds or participate in catalytic reactions.

Overall, analyzing the electron configuration of elements is a crucial step in studying the fundamental principles of chemistry.