Additional Chemistry Revision
*Copied from the AQA revision guide.
-When two or more elements react together compounds are formed. The atoms of elements join together by sharing electrons or by transferring electrons to achieve stable electronic structures. Atoms of the noble gases have stable electronic structures.
-When atoms of non metallic elements join together by sharing electrons it is called covalent bonding.
-When metallic elements react with non metallic elements they produce ionic compounds, the metal atoms lose electrons to form positive ions. The atoms of non metals gain electrons to form negative ions. The ions have the stable electronic structure of a noble gas. The oppositely charged ions attract each other in the ionic compound and this is called ionic bonding.
-Elements in group 1 of the periodic table…