Electron Arrangements Page 3

Electron Arrangements

Representing Electron Arrangements

Method

Steps

Example

Orbital

• Determine the highest energy sublevel of the atom

diagram

• Use the Aufbau principle to draw sublevels in filling order

• Fill orbitals with the correct number of electrons

• Atomic number is same as number of electrons in

neutral atom

Electron

• Determine the highest energy sublevel of the atom

configuration

• Write the sublevels in the order they are filled

• Write the number of electrons in each sublevel as a

superscript on each sublevel

Noble gas

• Write the noble gas of the previous period in brackets

configuration

• Write the remainder of the electron configuration

afterwards

• End of the electron configuration of each element contains valence electrons

Chemistry 3.4 – Electron Arrangements

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