What Is Hybridisation?In chemistry Class 11 ncert?

Question

Answer

Hybridization happens when atomic orbitals mix to form a new atomic orbital. The new orbital can hold the same total number of electrons as the old ones. The properties and energy of the new, hybridized orbital are an 'average' of the original unhybridized orbitals.

The concept of hybridization was introduced because it was the best explanation for the fact that all the C - H bonds in molecules like methane are identical.

Example

In their ground state, carbon atoms naturally have electron configuration 1s2 2s2 2p2.

The four outermost electrons, i.e. those in the 2s and 2p sublevels are available to form chemical bonds with other atoms.

The 2s orbital is capable of holding up to two electrons, and there are three 2p orbitals, each capable of holding up to two electrons, which means the 2p orbitals can hold up to six electrons.

Individually, these electron orbitals look something like this. (Each is centered on carbon's nucleus and the p orbitals make angles of 90deg with one another.)

Answer

The mixing of orbitals having similar energies and the resultant orbitals are of same size shape and energies....one-s orbital and one-p orbital give sp hybrid orbital ...shape = linear angle = 180one-s orbital and two-p orbital give sp2 hybrid orbital ...shape = triangular planer angle = 120one-s orbital and three-p orbital give sp3 hybrid orbital ...shape = tetrahedral angle = 109.5one-s orbital three-p orbital  and one-d give sp3d hybrid orbital ...shape = triangular bipyramidal angle = 120 and 90one-s orbital three-p orbital two-d give sp3d2 hybrid orbital ...shape = octahedral angle = 90one-s orbital three-p orbital three-d give sp3d3 hybrid orbital ...shape = pentagonal bipyramidal angle = 70 and 90 .....but their shapes may change when the lone pair increases ......

Answer

What is Hybridization in Chemistry?

Hybridization is a concept in chemistry that explains the formation of new atomic orbitals by mixing the orbitals of different energy levels. It is used to describe the bonding and molecular geometry of chemical compounds. Hybridization is an important concept in understanding the shapes of molecules and predicting their properties.

Types of Hybridization:

There are different types of hybridization that can occur depending on the number and types of atomic orbitals involved:

1. sp Hybridization: This type of hybridization occurs when one s orbital and one p orbital combine to form two sp hybrid orbitals. These orbitals are linear in shape and are found in molecules like BeCl2 and linear carbon compounds.

2. sp2 Hybridization: In this type of hybridization, one s orbital and two p orbitals combine to form three sp2 hybrid orbitals. These orbitals are trigonal planar in shape and are found in molecules like ethene (C2H4) and boron compounds.

3. sp3 Hybridization: This is the most common type of hybridization. It occurs when one s orbital and three p orbitals combine to form four sp3 hybrid orbitals. These orbitals are tetrahedral in shape and are found in molecules like methane (CH4) and water (H2O).

4. sp3d Hybridization: This type of hybridization occurs when one s orbital, three p orbitals, and one d orbital combine to form five sp3d hybrid orbitals. These orbitals are trigonal bipyramidal in shape and are found in molecules like phosphorus pentachloride (PCl5).

5. sp3d2 Hybridization: In this type of hybridization, one s orbital, three p orbitals, and two d orbitals combine to form six sp3d2 hybrid orbitals. These orbitals are octahedral in shape and are found in molecules like sulfur hexafluoride (SF6).

Importance of Hybridization:

Hybridization helps in explaining the bonding and geometry of molecules. It allows us to understand the shapes of molecules and predict their properties such as polarity, reactivity, and stability. Hybrid orbitals are formed by mixing atomic orbitals, which leads to the formation of stronger and more stable bonds. Additionally, hybridization helps in explaining the phenomenon of resonance in molecules.

In conclusion, hybridization is a fundamental concept in chemistry that helps in understanding the bonding and molecular geometry of compounds. It plays a crucial role in predicting the properties and behavior of molecules. Understanding hybridization is important for students studying chemistry at the Class 11 level.

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