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3 Rules Of Electron Configuration

Question

What are the rules that must exist followed to write the electronic configuration of elements?


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Solution

Electronic configuration:

  • "The distribution of electrons into various orbitals of an atom is chosen its electronic configuration".

Rules for writing electronic configuration:

In that location are 3 rules for writing electronic configuration:

  • Aufbau principle
  • Pauli's exclusion principle
  • Hund's Rule

1. Aufbau principle:

  • "It states that in the ground state of the atoms, the orbitals are filled in order of their increasing energies."
  • The social club of filling of the electrons goes this way:1s,2s,2p,3s,3p,4s,3d,4p,5s,4d,5p,4f,5d,6p,7s…
  • Each atomic orbital can simply conform just 2 electrons that are in contrary spin simply.
  • And so, the 1st beat can have 2 electrons in but 1s. The 2d crush can have 8 electrons, 2 in 2s and half-dozen in 2p. The tertiary subshell can have 18 electrons, 2 in 3s, vi in 3p and 10 in 3d.
Aufbau Principle - Detailed Explanation, Diagram, Exceptions

2. Pauli'due south exclusion principle:

  • "No two electrons in an atom can accept the same set of four quantum numbers. Pauli exclusion principle can also be stated as: "Simply two electrons may exist in the same orbital and these electrons must have opposite spin.
Pauli Exclusion Principle - Definition, Explanation, Examples

3. Hund'southward Rule:

  • "It states: the pairing of electrons in the orbitals belonging to the aforementioned subshell (p, d or f) does not take place until each orbital belonging to that subshell has got ane electron each i.e., it is singly occupied."
Hunds Rule of Maximum Multiplicity - Explanation for Atomic Energy Levels  and Configuration

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3 Rules Of Electron Configuration,

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