# Electron configuration and orbital diagram

## 6.4 Electronic Structure of Atoms (Electron Configurations)

The purpose of introducing quantum numbers has been to show that similarities in the electron arrangement or electron configuration lead to.

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In atomic physics and quantum chemistry , the electron configuration is the distribution of electrons of an atom or molecule or other physical structure in atomic or molecular orbitals. Electronic configurations describe each electron as moving independently in an orbital, in an average field created by all other orbitals. Mathematically, configurations are described by Slater determinants or configuration state functions. According to the laws of quantum mechanics , for systems with only one electron, a level of energy is associated with each electron configuration and in certain conditions, electrons are able to move from one configuration to another by the emission or absorption of a quantum of energy, in the form of a photon. Knowledge of the electron configuration of different atoms is useful in understanding the structure of the periodic table of elements. This is also useful for describing the chemical bonds that hold atoms together. In bulk materials, this same idea helps explain the peculiar properties of lasers and semiconductors.

The electrons of an atom all have the same charge and the same mass, but each electron has a different amount of energy. Electrons that have the lowest energy are found closest to the nucleus where the attractive force of the positively charged nucleus is the greatest and the electrons that have higher energy and are able to overcome the attractive force of the nucleus are found further away. We will start with a very simple view of the arrangement or configuration of electrons around an atom. This view simply states that electrons are arranged in energy levels or shells around the nucleus of an atom. These energy levels are numbered 1, 2, 3, etc. Electrons that are in the first energy level energy level 1 are closest to the nucleus and will have the lowest energy.

Having introduced the basics of atomic structure and quantum mechanics, we can use our understanding of quantum numbers to determine how atomic orbitals relate to one another. This allows us to determine which orbitals are occupied by electrons in each atom. The specific arrangement of electrons in orbitals of an atom determines many of the chemical properties of that atom. The energy of atomic orbitals increases as the principal quantum number, n , increases. Figure 1 depicts how these two trends in increasing energy relate. The 1 s orbital at the bottom of the diagram is the orbital with electrons of lowest energy.

Determine the electron configuration for elements and ions, identifying the relation between electron shells and subshells.
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Electron orbital diagrams and written configurations tell you which orbitals are filled and which are partially filled for any atom. The number of valence electrons impacts on their chemical properties, and the specific ordering and properties of the orbitals are important in physics, so many students have to get to grips with the basics. Electron configurations have the format: 1s 2 2s 2 2p 6. Electron configurations are expressed through a notation that looks like this: 1s 2 2s 2 2p 1. Learn the three main parts of this notation to understand how it works.

## Electron configuration

Electron Configuration - Quick Review!

Electron Configuration - Basic introduction

The electron configuration of an atom is the representation of the arrangement of electrons distributed among the orbital shells and subshells.
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Presentation on theme: "Electron Configuration and Orbital Diagrams"— Presentation transcript: