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Atomaire bindingen - ionische binding - covalente binding- metallische binding
Ionic bonding 1 between a Li atom and a F atom E
Ionic bonding 2 E gives Li+ F- molecule Electron Affinity (EA)Ionization Potential (IP) E Energy cost: DE = IP(Li) – EA(F)
Ionic bonding 3 Ionic binding curve: electron transfer Pauli repulsionCoulomb attraction ions Binding curve has stable minimum !!
Ionic bonding 4 only works between very dissimilar atoms !!
Ionic bonding in solidscommon salts have ionic bonding NaCl structure CsCl structure Cs+ Na+ Cl- Cl- structure determined by relative size ions
electron wants to pull wells close !!Covalent bonding 1 Model system: one electron in two wells wells far apart wells close ES < EA electron wants to pull wells close !!
Covalent bonding 2 E H2 molecule: two electrons in two wells H atomallowed by Pauli
Covalent bonding 3 E He2 molecule? four electrons He atom He2 moleculeno electronic bonding in He2 no stable He2 molecule !! because of Pauli exclusion principle
Hetero-atomic covalent bondingH F molecule H atom F atom E polar bond !!
covalent bonding gives directional bonds !!Poly-atomic covalent bonding 1 H2O molecule 2 2 covalent bonding gives directional bonds !!
Poly-atomic covalent bonding 2CH4 molecule: tetraeder C hybrid orbital
Covalent bonding in solidsC, Si, ... have covalent bonding and compound semiconductors: GaAs, ... diamond structure
has a wave-like character (delocalized)Metallic bonding in solids 1 metal: one electron in many wells positive ions has a wave-like character (delocalized)
Twee verschillende metalen met elkaar in contact contact-potentiaal
Volgende (laatste) hoor-college: Quantum theorie van electrische geleiding Isolatoren vs. (half)geleiders, supergeleiders Terugblik op de gehele stof
Chemical Bonding and Interactions
Trends in the Periodic Table and Bonding
Why do atoms form bonds? To attain a noble gas configuration. How do atoms form bonds? By gaining, losing, or sharing electrons. Gain or loss of electrons.
Polarizability More electrons are further from the nucleus Nucleus has less pull on far off electrons The more electrons the more “polarizability” More.
Chemical Bonds and Molecular Geometry. Electrons Valence electrons Those electrons that are important in chemical bonding. For main-group elements,
Chapter 5 Section 2 – Ionic Bonding and Salts
Chemical Bonding Objectives: 1.describe the nature of a chemical bond and its relationship to valence electrons 2.compare ionic and covalent bonding 3.use.
Ionic Bonding. CA Standards Students know atoms combine to form molecules by sharing electrons to form covalent or metallic bonds or by exchanging electrons.
Ch. 6 Chemical Bonding What type of atom is stable or neutral in nature? Noble Gases – outer energy level is satisfied What is a chemical bond? An attraction.
Chemical Bonding Covalent Bonds vs Ionic Bonds.
Physics 440 Condensed Matter Physics a.k.a. Materials Physics Solid-State Physics.
Lecture 2711/07/05. Ionic bond Ionic compounds Valence electrons are transferred from one atom to another Metal + non-metal NaCl Bonding.
Molecular Orbitals: combine atomic orbitals (AOs) from all the atoms in a molecule into the same number of molecular orbitals. MOs have different shapes,
Screening As a free electron approaches a positive cation, it will be attracted to the nucleus. But, it is also repelled by any electrons orbiting the.
Dr. Jie ZouPHY Chapter 43 Molecules and Solids.
Properties of Bonds Polarity Bond Order Bond Length Bond Energy.
P461 - Molecules1 MOLECULES BONDS Ionic: closed shell (+) or open shell (-) Covalent: both open shells neutral (“share” e) Other (skip): van der Waals.
Objectives Know atoms combine to form molecules by sharing electrons to form covalent or metallic bonds or by exchanging electrons to form ionic bonds.
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