Bonding - (CCEA)Covalent bonds

Atoms and ions bond with each other in three main ways – ionic bonds, covalent bonds and metallic bonds. Different types of bonds form different types of structures – lattices and molecules.

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Covalent bonds

**HIGHER TIER: Any reference to H2O, NH3, CH4, O2, N2 or CO2 bonding is higher tier.**

A is formed when two atoms share electrons to obtain a noble gas configuration. Covalent bonding occurs between non-metal atoms.

Covalent bonds are strong and require substantial amounts of energy to break.

Covalent bond: a shared pair of electrons.

Molecule: two or more atoms covalently bonded together.

: two atoms covalently bonded together in a molecule. O2, N2 and Cl2 are examples of diatomic molecules.

Covalent bonding**

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Dot and cross diagrams for covalent bonding
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Dot and cross diagrams to show formation of ions

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