Chemistry · Structure 2: Models of bonding and structure. The idea in plain words, the rules to remember, the mistake to avoid and a worked example, written and checked by Mega Lecture.
Ionic, covalent and metallic bonding are not separate boxes. They are the corners of a bonding triangle, and most substances lie somewhere between them. The position of a substance is found from two numbers: the difference in electronegativity (Δχ) of its elements and their average electronegativity. From the position you can predict properties such as melting point, conductivity and solubility.
An alloy is a mixture of a metal with other metals or non-metals. Atoms of a different size disturb the regular layers, so the layers slide less easily and the alloy is harder and stronger than the pure metal.
A polymer is a very large molecule made by joining many small molecules called monomers.
Drawing the repeating unit with the C=C double bond still in it, or putting a side group such as CH3 into the chain. Only the two double-bonded carbons form the backbone.
Answer: Ionic region: high melting point, conducts electricity when molten but not when solid
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