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Electronic Structure
Electrons have fixed energy levels. The electrons move around the nucleus in certain
regions of the atom called shells or energy levels.

Each shell is given a number called the principal quantum number. The further a shell is
from the nucleus, the higher its energy and the larger…

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Filling up Atomic Orbitals
The arrangement of electrons in shells and orbitals is called the electronic configuration of
an atom.

The orbitals are filled in a definite order to produce the lowest energy arrangement
possible.

The orbitals are filled up in order of increasing energy.

Where there is more than…

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Electron Shells Overlap
The larger the value of principal quantum number n, the higher the energy level and the
further the shell is from the nucleus.

As we move from one shell to the next, a new type of sub-shell is added.

Within a shell, the sub-shell energies increase in…

Page 4

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Electronic Configurations and the Periodic Table
The periodic table is structured in blocks of 2, 6, 10 and 14 elements, linked to sub-shells.

The pattern mirrors the sub-shells that are being filled.




The s-block elements have an outer shell configuration of s1 or s2.

Lithium 1s22s2
Magnesium 1s22s22p63s2

The p-block…

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