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Electron Configuration - Coggle Diagram
Electron Configuration
Ground-State Electron Configuration
Electron configuration is the arrangement of electrons in an atom.
The most stable, lowest-energy arrangement of the electrons is called the element’s ground-state electron configuration.
The Aufbau Principle
States that each electron occupies the lowest energy orbital available.
Learn the sequence of atomic orbitals from lowest energy to highest energy.
Aufbau Diagram
Describes the sequence in which orbitals are filled with electrons, but atoms are not built up electron by electron.
The Pauli Exclusion Principle
a maximum of two electrons can occupy a single atomic orbital,only if the electrons have opposite spins.
each orbital can contain, at most, two electrons, the maximum
number of electrons related to each principal energy level equals 2 n ^2 .
An atomic
orbital containing paired electrons with opposite spins is written as (arrows up and down)
Hunds Rule
Hund’s rule states that single electrons with the same spin must occupy each equal-energy orbital before additional electrons with opposite spins can occupy the same orbitals.
negatively charged electrons repel each other and this impacts on the distribution of electrons in equal- energy orbitals.
Electron Arrangement
You can represent an atom’s electron configuration using one of two convenient methods:
Orbital Diagrams
Electrons in orbitals can be
represented by arrows in boxes.
Each box is labeled with the principal
quantum number and sublevel associated with the orbital.
Example
Electron Configuration Notation
It designates the principal energy level and energy sublevel
associated with each of the atom’s orbitals.
It includes a superscript
representing the number of electrons in the orbital.
Example
1s, 2s, 2 p x, 2 p y, 2 p z
It does not usually show
the orbital distributions of electrons related to a sublevel.
Noble-Gas Notation
A method of representing electron configurations of noble gases.
It uses bracketed symbols.
The electron configuration for an element can be represented using the noble-gas notation for the noble gas in the previous period and the electron configuration for the additional orbitals being filled.
