Earth Materials by Kevin Hefferan, John O'Brien

By Kevin Hefferan, John O'Brien

Minerals and rocks shape the root of geologic reports. first-class textbooks presently exist in mineralogy, igneous petrology, sedimentary petrology and metamorphic petrology. it's not our goal to compete with those textbooks. although, many universities have compressed separate mineralogy and petrology classes right into a one- or two-semester Earth fabrics path. shortly, no textbook appropriately addresses the desires of an Earth fabrics path. we've built a textbook that encompasses the examine of minerals, rocks in addition to soil and water. This Earth fabrics textbook is geared in the direction of a one- or two-semester Earth fabrics direction, a mixed mineralogy and petrology direction, and will even be utilized by environmental scientists, engineering geologists, planners and laypersons attracted to studying approximately minerals, rocks, soil and water in a accomplished framework. now we have tried to create a readable, good illustrated textbook that's understandable and that weaves varied disciplines into one cohesive fabric.Key beneficial properties of this booklet include:Equal assurance of mineralogy, sedimentary petrology, igneous petrology and metamorphic petrologyCopious box examples and nearby relationships with pictures that illustrate the ideas discussedNumerous case reports to teach the makes use of of earth fabrics as assets and their basic function in our lives and the worldwide economic system, and their relation to ordinary and human-induced hazardsThe integration of earth fabrics right into a cohesive process-based earth structures framework2 colour all through with a sixty four pages four colour sectionA better half site is on the market for this name at www.wiley.com/go/hefferan/earthmaterials. 

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Ionic bonds also form when group IIA and group VIA elements combine. In the mineral periclase (MgO), magnesium (Mg+2) and oxygen (O−2) ions are bonded together to form MgO. In this case, electropositive, metallic magnesium atoms from group IIA tend to donate two valence electrons to become stable, smaller divalent magnesium cations (Mg+2) while highly electronegative, nonmetallic oxygen atoms from group VIA capture two valence electrons to become stable, larger divalent oxygen anions (O−2). 11 The relationship between attractive and repulsive forces between ions produces a minimum net force when the near spherical surfaces of the ions are in contact.

In such situations, each atom releases valence electrons to achieve a stable electron configuration. The positions of the valence electrons fluctuate or migrate between atoms. 14). The weak attractive forces between positive partial atoms and valence electrons bond the atoms together. Unlike the strong electron-sharing bonds of covalently bonded substances, or the sometimes strong electrostatic bonds of ionically bonded substances, metallic bonds are rather weak, less permanent and easily broken and reformed.

B) Ions of opposite charge attract to form crystals such as sodium chloride (NaCl). them that results from their opposite charges. Larger clusters of ions form as additional ions exchange electrons and are bonded and crystals begin to grow. 10). 0). Sodium has a strong tendency to give up one electron to achieve a stable electron configuration. 5). It has a strong tendency to gain one electron to achieve a stable electron configuration. When sodium and chlorine atoms bond, the sodium atoms release one electron to become smaller sodium cations (Na+1) with the “stable octet” electron configuration (neon), while the chlorine atoms capture one electron to become larger chloride anions (Cl−1) with “stable octet” electron configurations.

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