Explain why alloys such as brass, bronze and stainless steel are mixtures rather than compounds, and account for their greater hardness and strength compared with pure metals through non-directional metallic bonding and disrupted layers of atoms.
The table shows the average electronegativity and the electronegativity difference for four substances, each made from two elements. Substance Average electronegativity Electronegativity difference P 3.3 0.3 Q 2.0 2.3 R 1.4 0.3 S 2.7 1.1 Which substance is an…