- The document discusses molecular orbital theory, which describes chemical bonding through the combination of atomic orbitals into molecular orbitals.
- Key features include molecular orbitals being formed from linear combinations of atomic orbitals, with bonding, antibonding, and nonbonding molecular orbitals resulting. Electrons fill these orbitals based on orbital energy.
- The formation of molecular orbitals from atomic orbitals of hydrogen is used as an example, with bonding and antibonding molecular orbitals illustrated.
A detailed presentation about what is MOT. Explaining its principles, sigma and pi bonds, bond order, and molecular stability. A good and knowledgeable presentation to understand these concepts.
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
A detailed presentation about what is MOT. Explaining its principles, sigma and pi bonds, bond order, and molecular stability. A good and knowledgeable presentation to understand these concepts.
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
Valence shell electron pair repulsion theory (VSEPR THEORY)Altamash Ali
Designed in a very easy manner so that u all are able to understand each and everything easily.
Gillespie & Nyholm proposed this theory ion 1957 and its is based on the direction of bonds in a polyatomic molecule.
Based on this there are several postulate that are very necessary to know before any molecule to study.
Applied Chemistry, atomic and molecular structure, part 1, by Shiraz mahbob PhDMaqsoodAhmadKhan5
applied chemistry lecture and slide,
Applied Chemistry, atomic and molecular structure, part 1, by Shiraz mahbob PhD, lecturer in chemistry in pakistan institute of engineering and applied sciences
Valence shell electron pair repulsion theory (VSEPR THEORY)Altamash Ali
Designed in a very easy manner so that u all are able to understand each and everything easily.
Gillespie & Nyholm proposed this theory ion 1957 and its is based on the direction of bonds in a polyatomic molecule.
Based on this there are several postulate that are very necessary to know before any molecule to study.
Applied Chemistry, atomic and molecular structure, part 1, by Shiraz mahbob PhDMaqsoodAhmadKhan5
applied chemistry lecture and slide,
Applied Chemistry, atomic and molecular structure, part 1, by Shiraz mahbob PhD, lecturer in chemistry in pakistan institute of engineering and applied sciences
these slides will help you learn all the basic about chemical bonding. concept of valancy, concept of electronic configuration, types of chemical bonds, and how do atoms form bonds.
Valence Bond Theory According to valence band the.pdfanugrahafancy
Valence Bond Theory According to valence band theory a covalent bond is formed
between the two atoms by the overlap of half filled valence atomic orbitals of each atom
containing one unpaired electron. Valence bond theory considers that the overlapping atomic
orbitals of the participating atoms form a chemical bond. Because of the overlapping, it is most
probable that electrons should be in the bond region. Valence bond theory views bonds as
weakly coupled orbitals (small overlap). Valence bond theory is typically easier to employ in
ground state molecules. Hybridization It is the concept of mixing atomic orbitals to form new
hybrid orbitals suitable for the qualitative description of atomic bonding properties. Hybridised
orbitals are very useful in the explanation of the shape of molecular orbitals for molecules. It is
an integral part of valence bond theory. Molecular orbital theory molecular orbital (MO) theory
is a method for determining molecular structure in which electrons are not assigned to individual
bonds between atoms, but are treated as moving under the influence of the nuclei in the whole
molecule. In this theory, each molecule has a set of molecular orbitals, in which it is assumed
that the molecular orbital wave function ?f may be written as a simple weighted sum of the n
constituent atomic orbitals ?i Metallic Bonding Metallic bonding is the electrostatic attractive
forces between the delocalized electrons, called conduction electrons, gathered in an \"electron
sea\", and the positively charged metal ions.
Solution
Valence Bond Theory According to valence band theory a covalent bond is formed
between the two atoms by the overlap of half filled valence atomic orbitals of each atom
containing one unpaired electron. Valence bond theory considers that the overlapping atomic
orbitals of the participating atoms form a chemical bond. Because of the overlapping, it is most
probable that electrons should be in the bond region. Valence bond theory views bonds as
weakly coupled orbitals (small overlap). Valence bond theory is typically easier to employ in
ground state molecules. Hybridization It is the concept of mixing atomic orbitals to form new
hybrid orbitals suitable for the qualitative description of atomic bonding properties. Hybridised
orbitals are very useful in the explanation of the shape of molecular orbitals for molecules. It is
an integral part of valence bond theory. Molecular orbital theory molecular orbital (MO) theory
is a method for determining molecular structure in which electrons are not assigned to individual
bonds between atoms, but are treated as moving under the influence of the nuclei in the whole
molecule. In this theory, each molecule has a set of molecular orbitals, in which it is assumed
that the molecular orbital wave function ?f may be written as a simple weighted sum of the n
constituent atomic orbitals ?i Metallic Bonding Metallic bonding is the electrostatic attractive
forces between the delocalized e.
STEROCHEMISTRY AND BONDING IN MAIN GROUP COMPOUNDS GaurangRami1
Inorganic Chemistry : STEROCHEMISTRY AND BONDING
IN MAIN GROUP COMPOUNDS
Content of chapter:
01. Hybridization
02. VSEPR
03. Walse Diagram
04. Bent Rule
05. Dπ - Pπ Bonds
To determine the relative viscosity of given liquid using Ostwald’s viscometer
*Presentation Overview*
Aim, Apparatus and Chemicals, Theory, Procedure, Observations, Calculations, Result
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
2024.06.01 Introducing a competency framework for languag learning materials ...
Molecular Orbital Theory
1. Molecular Orbital Theory
B.Sc. SEM-V
Paper-II (Physical Chemistry)
Dr. N. G. Telkapalliwar
Associate Professor
Department of Chemistry
Dr. Ambedkar College, Nagpur
2. Molecular Orbital Theory
The Molecular Orbital Theory (often abbreviated to MOT) is a theory on chemical
bonding developed at the beginning of the twentieth century by F. Hund and R. S.
Mulliken to describe the structure and properties of different molecules.
The key features of the molecular orbital theory are listed below.
The total number of molecular orbitals formed will always be equal to the total
number of atomic orbitals offered by the bonding species.
There exist different types of molecular orbitals viz; bonding molecular orbitals,
anti-bonding molecular orbitals, and non-bonding molecular orbitals. Of these, anti-
bonding molecular orbitals will always have higher energy than the parent orbitals
whereas bonding molecular orbitals will always have lower energy than the parent
orbitals.
The electrons are filled into molecular orbitals in the increasing order of orbital
energy (from the orbital with the lowest energy to the orbital with the highest
energy).
3. The most effective combinations of atomic orbitals (for the formation of
molecular orbitals) occur when the combining atomic orbitals have similar
energies.
In simple terms, the molecular orbital theory states that each atom tends to
combine together and form molecular orbitals.
Each molecular orbital is associated with a wave function denoted by and
probability of finding electron is given by 2. Wave function of molecular orbital
can be obtained by linear combination of atomic orbitals.
Shape and size of molecular orbital is determined by shapes and sizes of atomic
orbitals from which they are formed.
Electrons are filled in various molecular orbitals according to Aufbau principle,
Hund’s rule and Pauli’s exclusive principle.
Continue …………
4. Conditions for formation of molecular orbitals
The conditions that are required for the linear combination of atomic orbitals are as
follows:
1) Same Energy of Combining Orbitals
The atomic orbitals combining to form molecular orbitals should have comparable
energy. This means that 2p orbital of an atom can combine with another 2p orbital of
another atom but 1s and 2p cannot combine together as they have appreciable energy
difference.
2) Same Symmetry about Molecular Axis
The combining atoms should have the same symmetry around the molecular axis for
proper combination, otherwise, the electron density will be sparse. For e.g. all the sub-
orbitals of 2p have the same energy but still, 2pz orbital of an atom can only combine
with a 2pz orbital of another atom but cannot combine with 2px and 2py orbital as they
have a different axis of symmetry. In general, the z-axis is considered as the molecular
axis of symmetry.
3) Proper Overlap between Atomic Orbitals
The two atomic orbitals will combine to form molecular orbital if the overlap is proper.
Greater the extent of overlap of orbitals, greater will be the nuclear density between the
nuclei of the two atoms.
The condition can be understood by two simple requirements. For the formation of
proper molecular orbital, proper energy and orientation are required. For proper energy,
the two atomic orbitals should have the same energy and for the proper orientation, the
atomic orbitals should have proper overlap and the same molecular axis of symmetry.
13. •The valence bond theory was proposed by Heitler and London to
explain the formation of covalent bond quantitatively using quantum
mechanics.
•Later on, Linus Pauling improved this theory by introducing the
concept of hybridization.
•Valence bond (VB) theory assumes that all bonds are localized bonds
formed between two atoms by the donation of an electron from each
atom.
•Valence Bond theory describes covalent bond formation as well as the
electronic structure of molecules.
•The theory assumes that electrons occupy atomic orbital's of individual
atoms within a molecule, and that the electrons of one atom are attracted
to the nucleus of another atom.
Formation of hydrogen molecule on the basis of
Valence bond theory
14. •A covalent bond is formed by the overlapping of two half filled valence
atomic orbital's of two different atoms.
•The electrons in the overlapping orbital's get paired and confined between
the nuclei of two atoms.
•The electron density between two bonded atoms increases due to
overlapping. This confers stability to the molecule.
•Greater the extent of overlapping, stronger is the bond formed.
•The direction of the covalent bond is along the region of overlapping of the
atomic orbital's i.e., covalent bond is directional.
•Example: Hydrogen molecule (H2)
Continue………….
15. VB theory looks at covalent bonding as an overlap of atomic orbitals rather
than just a sharing of electrons as in previous theories. A covalent bond in VB
theory is a bond formed when the atomic orbitals of two atoms overlap and
each share one electron each having opposite spins in the overlap region
between the atoms. This overlap region is a region of high electron
density which serves to hold the atoms together.
The reason this overlap creates a bond between the atoms is there's a
reduction in the overall potential energy of the molecule compared to the
combined potential energies of the atoms separately.
16.
17.
18.
19.
20. Example of the diatomic hydrogen molecule (H2)
A relative plot of potential energy versus distance apart between two hydrogen
atoms. To the far right, the hydrogen atoms are separated from each other, seen as a
gap between the two spheres. The nominal potential energy of the separate atoms is
at the level of the x-axis. As the atoms begin to overlap (center image), there's a
reduction in potential energy (PE) relative to the separated atoms. This reduction in
PE continues as the atoms overlap more until it reaches a minimum (left image).
This is where we consider the bond being formed and the distance between the atoms
as being the associated bond length of that covalent bond. If we were to increase the
overlap of the atomic orbitals more, the PE goes up sharply suggesting that other
interactions come into play increasing the overall PE. The optimum distance between
the two atoms, the bond length, for H-H bond is 75 pm (picometers). So, atoms can
only get so close before problems begin to arise but must be close enough in order to
minimize the potential energy of the molecule.