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Periodicity
Trends in Bonding Across Period 3
• On crossing period 3, the ionisation energies of the elements increase so it becomes more difficult to remove electrons and form metallic structures.
• Covalent bonding becomes more common on crossing a period from left to right.
Nametallic
Mgmetallic
Almetallic
Sicovalent
Pcovalent
Scovalent
Clcovalent
Ar-
The trends in intramolecular bond type can be seen in the following table:
Argon
• Argon is a noble gas and will form neither metallic nor covalent bonds.
• The ionisation energy is very high so metallic bonding is not possible.
• There are no unpaired electrons so covalent bonding is not possible.
• It forms no bonds and exists as a free gaseous atom.