5.1 Formation of Compounds

Stability of noble gases
■ Elements

	►	Can combine to form compounds.
	►	Noble gases, sulphur, gold, silver and diamond exist in their free states.
	►	Other elements exist as compounds.

■ Compound

	►	A compound is a substance formed when two or more chemical elements are chemically bonded together in fixed ratios.
	►	Most minerals (compound) on the earth's crust are metallic oxides and sulphides.
	►	The tendency of elements to combine with other elements show that compounds are more stable than their constituent elements.

■ Stability of noble gases

	►	All noble gases are very stable, inert and inactive chemically.
	►	The noble gases do not donate, receive or share any more electrons, as their valence shells are full.

■ Formation of chemical bonds

	►	All other elements combine chemically with other elements to attain the stability of the noble gases.
	►	Two types of chemical bonds in compounds are : ○ Ionic bonds : Donating / receiving electrons to form ionic compounds. ○ Covalent bonds : Sharing electrons to form covalent compounds

■ This video contains information on the formation of compounds.

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5.2 Formation of Ionic Bonds →

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