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Table of Content
 1 Electron Configuration Chart: 2 How to Find Electron Configuration? 3 Shells and Subshells: 4 Difference Between Atomic Number and Atomic Mass: 5 What are the main rules for electron configuration? 6 What is the KLMN shell? 7 Do electrons affect atomic mass?
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An online electron configuration calculator helps you to determine the electron configuration of any element. This electron calculator displays the abbreviated configuration and the atomic number of each element. Read on to understand abbreviated electron configuration, shells, subshell, and how to find electron configuration of an atom or element.

## What is Electron Configuration?

In quantum chemistry and atomic physics, the electron configuration of an atom or molecule describes the distribution of electrons in different atomic or molecular orbitals. It also describes every electron as moving freely in an orbital, in an average field generated by other orbitals. For example, electron configuration of Phosphorus (P) is 1s^2 2s^2 2p^6 3s^2 3p^3.

Usually, Physicists and chemists use the standard notation to refer to the electronic configurations of molecules and atoms. For atoms, the standard notation consists of a series of atomic subshell labels (for example, phosphorus sequence of notation is 1s, 2s, 2p, 3s, 3p), where the number of electrons assigned to each subshell is used as a superscript. For example, hydrogen has just 1 electron in the s orbital of the first shell, so its electron configuration notation is recorded as 1s^1. Lithium has two electrons in the 1s subshell and one electron in the 2s subshell (higher energy), so its electron configuration is 1s^2 and 2s^1.

Apart from this, Electron Configuration:

• Use for interpreting atomic spectra.
• Finds the valency of an element.

### Electron Configuration Chart: ### How to Find Electron Configuration?

Our free-electron configuration calculator also depicts an abbreviated way of finding electron configuration. If you want to do manually then follow the steps below to write shorthand electron configurations:

• First, find the required element on the periodic table. For example, calcium is element 20.
• Now, find the atomic number of the first noble gas in the periodic table.
• Write the noble gas symbol in parentheses to start its electronic configuration. Put the atomic number of the noble gas under this symbol so that you know the number of electrons.
• Then, continue writing the electron configuration of a certain element until you reach the correct number of electrons.

However, an Online Angular Velocity Calculator allows you to determine the angular velocity of the body in motion on a circular path.

### Shells and Subshells:

Electron shells are a set of feasible states that have the same principal quantum number n (the number before the letter on the orbital) that the electron can occupy. An atom with an nth electron shell can hold 2n^2 electrons, which is the first shell that can hold 2 electrons, the second shell can hold 8 electrons, and so on.

A subshell is a set of states, which are defined by the total azimuth quantum number “l” in the shell. The range of ℓ value is 0 to n-1. The values ​​of ℓ = 0, 1, 2, and 3 correspond to the orbit s, p, d, and f, respectively.

### Difference Between Atomic Number and Atomic Mass:

It is believed that the atomic mass of an element is closely related to the atomic number, because if the atomic mass is high, then the atomic number is also high, what is the difference between atomic mass and atomic number? To find out, let’s look at some key differences.

 Atomic Mass Atomic Number Atomic mass is related to the number of neutrons and protons present in a particular nucleus of an element. The atomic number is usually the number of protons present in the nucleus of an element. It is the average weight of an atom or molecule. It is the total number of nucleons in the atom’s nucleus. Atomic mass is always denoted by A The atomic number is always denoted by Z The atomic mass unit (AMU) is usually used to measure atomic mass. An atomic number is a number that is used to place elements in the periodic table.

However, an Online Photon Energy Calculator will allow you to find the energy of a photon from its wavelength & frequency.

## How Electron Configuration Calculator Works?

An online electron calculator finds the abbreviated or condensed electron configuration of an element with these instructions:

### Input:

• Enter an element to find the complete electron configuration of an element.
• Hit to calculate button for results.

### Output:

• An electron configuration calculator provides abbreviated electron configuration, standard state, atomic mass, and the number of an element.
• To find the electron configuration of other elements of the periodic table you need to click on recalculate button.

## FAQ:

### What are the main rules for electron configuration?

There are three important rules used for electron configuration: Pauli-exclusion Principle, Aufbau Principle, and Hund’s Rule.

### What is the KLMN shell?

K represents the first level of energy, L represents the second level of energy, M represents the third level of energy in an atom or molecule, and so on. In other words, the symbol         KLMN only represents the number of electrons in an atom.

### Do electrons affect atomic mass?

The mass of an electron is much smaller than a proton with only 9.11 x 10^{-28} grams or about 1/1800 atomic mass units. Therefore, they do not increase or decrease the total atomic mass of the element.

## Final Thoughts:

An online electron configuration calculator provides a condensed method of finding the electron configuration, atomic number, and atomic mass of given. The electronic configuration can quickly and easily tell the reader how many electron orbitals an atom has, and how many electrons there are in each atom.

## Reference:

From the source of Wikipedia: Shells and subshells, Notation, Energy—ground state and excited states.

From the source of Science Notes: Electron Configurations of Elements, How to Find Electron Configuration.

From the source of Chemistry Edu: Electron Configuration, Order of Fill, How to Write an Electron Configuration, Special Cases, Exceptions, Periodic Properties.