By Derek McMonagle
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Additional info for Chemistry: An Illustrated Guide to Science (Science Visual Resources)
This ion has three limiting forms. ● It is best represented as a resonance structure in which dotted lines indicate that the charge on the ion, 1-, is spread over all three of the nitrogen–oxygen bonds. 3 Sulfate ion © Diagram Visual Information Ltd. ● The sulfur atom is bonded to four oxygen atoms. This ion has three limiting forms. ● The ion’s exact form is constantly changing. It is best represented as a resonance structure in which dotted lines indicate that the charge on the ion, 2-, is spread over all four of the sulfur–oxygen bonds.
The particles vibrate and are able to move around, but they are held closely together. When a liquid is heated to its boiling point, the particles gain kinetic energy, moving faster and faster. Eventually, they gain sufficient energy to break away from each other and exist separately. There is a large increase in the volume of any substance going from a liquid to a gas. ● Within groups of metallic elements, the boiling point decreases down the group. The converse is true for nonmetals: the melting point increases down the group.
Each ion is surrounded by 6 oppositely charged ions. © Diagram Visual Information Ltd. 75. The coordination is 8:4. Each calcium ion is surrounded by 8 fluoride ions, while each fluoride ion is surrounded by 4 calcium ions. 3 Body-centered cubic structure (CaF2) cations anions 39 Crystal structure of metals: lattice structure 1 Hexagonal close packing ELEMENTS AND COMPOUNDS Key words body centered cubic packing crystal face-centered cubic close packing hexagonal close packing lattice unit cell Metallic crystals all other crystals, metallic crystals are composed of unit cells, sets of atoms, ions, or molecules in orderly three dimensional arrangements called lattices.
Chemistry: An Illustrated Guide to Science (Science Visual Resources) by Derek McMonagle