Chemistry holds a very important position in NEET Exam, so make your strategy accordingly with reference to topics. Here is one of the important topic for chemistry which is Bonding & Molecular Structure, in this article you will get the overview of this topic which will help you to make notes for NEET 2020 Exam.
Chemical bonding is the research of bonds that exist between the atoms or molecules. This chapter explains why solely certain atoms mix with one another and make a brand new product and their association in a particular form.
There are numerous theories like VSEPR, valence bond theory, the molecular orbital theory that can clarify all of the phenomena intimately. Bonding isn't just an occasion, however, it's nature's strategy to take each atom or molecule to its most steady-state.
All of the structures that exist within the universe are the results of the formation of certain sorts of bonds. This bonding is actual, is definitely nothing but combining one atom to the opposite. This mix of various atoms or “bonds” happens in a number of methods as follows:
(i) Ionic bond: Bond takes place after the entire exchange of electrons.
(ii) Covalent bond: Bond takes place after just sharing of the electrons.
(iii) Hydrogen bond: Bond takes place between a hydrogen atom and a few most electronegative atoms like oxygen, nitrogen, and fluorine.
(iv) Van der Waal forces of attraction: Bond takes place by the easy attraction between the atoms.
In our physique itself, all of the macro molecules like DNA, RNA, proteins, and many others are held along with the assistance of this chemical bonding.
All of the constructions are held along with the assistance of this chemical bond, either the bond is stronger or weaker. Primarily based on the power of the bonds, the steadiness of the structure is decided.
The melting level, boiling level, and many others are the necessary properties that are decided by the power of the chemical bond.
This chapter is often favored by each scholar as it is vitally straightforward and it holds sufficient distribution of marks in Board exams and different competitive exams like JEE and NEET.
Overview of Chemical Bonding:
All atoms on this universe search to attain their steady electronic configuration in the “Noble gas” configuration. Atoms besides Hydrogen obtain this steady noble gas configuration by following the octet rule within the following methods:
(i) Ionic bond: In this kind of bond, metals, and non-metals participate within the bond formation by the entire exchange of electrons.
(ii) Fazan's Rule: This rule states that in each ionic bond there's always some proportion of covalent character. This covalent character relies upon the dimensions of anion and cation, a charge of anion and cation.
Because the charge on cation is bigger and its measurement is smaller than its polarising energy will increase and thus the covalent character will increase.
Equally for anion, if its charge is greater and measurement can be bigger then its polarisability will increase and thus the covalent character will increase.
(iii) Covalent bond: This sort of bond formation takes place by the sharing of electrons between the non-metals.
(iv) Kossel Lewis Method: That is the best mannequin for explaining the structures of the chemical bond. This method considers the central atom as sphere and electrons as level charges round it.
Now, these level charges electrons are shared between atoms or utterly exchanged between atoms and form the covalent and ionic bond respectively. After the formation of those bonds, all of the atoms engaged in bonding to obtain the steady noble gas configuration.
(v) VSEPR Theory: In the VSEPR theory, it was being mentioned that the shapes of the molecules are decided by the mix of lone pair of electrons and bond pair electrons.
These electrons repel one another. As a way to reduce the repulsion, these electrons organize themselves on the most distance and hence form the geometry.
Some widespread geometries of the molecules are tetrahedral, sq. planar, octahedral, and so on.
All The Best To All The NEET 2020 Aspirants !