ERSC 2P21 Lecture Notes - Lecture 7: Silver, Polyatomic Ion, Metallic Bonding
19 Dec 2018
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Complex anions: polyatomic ion made up of 2 or more atoms covalently bonded that can be considered a single structural unit: hydroxide (oh), carbonates (co3)2, sulphates (so4)2, phosphates (po4)3, silicates (sio4)4- Native elements: single elements, never found in large quantities, 3 groups, metals, semi-metals, non-metals. Native arsenic, as: perfect cleavage in one direction, brittle. Native non-metals: s (sulphur), c (diamond, graphite, covalently bonded s8 molecule (as a boat , physical properties depend on crystal structure and bonds, van der waals bonds between the s8 molecules, h=1. 5 2. 5. Sulphides: oxygen-free compound of s and metal cation(s, large group, includes most important ore minerals, bonding varies from metallic, ionic to covalent bonds. Subgroup: sulphosalts: semi-metals in the metal cation sites. Halides: simple compounds of a halogen element bonded to an alkali or alkaline earth cation, tend to have pure ionic bonds, strong, equally bonded in all directions ( non-directional )
