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Capitolo 9
Tipi di legami chimici
Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type…
Simboli di Lewis e regola dell'ottetto
Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis…
Legame ionico e trasferimento di elettroni
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its…
Il ciclo Born-Haber
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a…
Tendenze nell'energia dei reticoli: dimensione e carica degli ioni
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a…
Legame covalente e strutture di Lewis
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual…
Elettronegatività
Whether a bond is nonpolar or polar covalent is determined by a property of the bonding atoms called electronegativity.  Electronegativity…
Polarità di legame, momento di dipolo e carattere ionico percentuale
The absolute value of the difference in electronegativity (ΔEN) of two bonded atoms provides a rough measure of the polarity to be expected…
Strutture di Lewis di composti molecolari e ioni poliatomici
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined: Determine the…
Risonanza
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O…
Cariche formali
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used…
Eccezioni alla regola dell'ottetto
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three…
Energie di legame e lunghezze di legame
Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break…
Legami nei metalli
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the…
Misurazione di coerenze ultraveloce vibrazionale in cationi poliatomici radicale con ionizzazione adiabatico del forte-campo
We present a pump-probe method for preparing vibrational coherences in polyatomic radical cations and probing their ultrafast dynamics. By shifting…
Preparazione di carbonio nanosheets a temperatura ambiente
Amphiphilic molecules equipped with a reactive, carbon-rich "oligoyne" segment consisting of conjugated carbon-carbon triple bonds self-assemble into…

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