## What is Heitler London theory?

In VB theory, derived from the original work by Heitler and London (1927), the formation of a covalent bond between two atoms is possible if the atoms have, in their valence shell, orbitals containing unpaired electrons: the pairing to a singlet coupled state of two electrons with opposite spin yields the formation of …

## What do you mean by valency class 9?

Hint: Valency of an element is defined as the number of hydrogen atoms that can combine with or replace one atom of the element, either directly or indirectly.

What are salient features of valence bond theory VBT )?

Explanation: Salient features of VBT: 1) A central metal ion provide number of vacant s,p & d orbital to ligands to form coordinate bond. 2) Number of vacant orbitals provided by central metal ion will equal to its coordination number.

### Who introduced valence bond theory?

Linus Pauling
In the valence bond (VB) theory, proposed in large part by the American scientists Linus Pauling and John C. Slater, bonding is accounted for in terms of hybridized orbitals of theā¦ The basis of VB theory is the Lewis concept of the electron-pair bond.

### What is the difference between sigma and pi bond?

Sigma bond is a chemical bond formed by the linear or co-axial overlapping of the atomic orbitals of two atoms. A pi bond is a type of covalent bond that exists between atoms where the electrons are on top and bottom of the axis connecting the nuclei of the joined atoms.

What is valency class 10th?

Valency:- Valency is defined as combining power of an element with other atom to form chemical bond. Valency refers to electron in outer shell of an atom.

#### What is valency formula?

Valency is calculated by calculating number of electrons present in outermost orbitals of atom of element. For example : Valency of Nitrogen is 3 because outermost orbital contain 3 electron.

#### What is valency class 7th?

Valency is defined as the combining capacity of an element. The electrons present in the outermost shell of an atom are called as valence electrons. An atom’s valence electron takes part in a chemical reaction because they have more energy than all the inner electrons.

What is valency by Brainly?

Expert-verified answer Valency is the combining power of an element. Explanation. Valency is defined as the number of hydrogen atoms that combines directly or indirectly with one atom of an element. If the number of electrons in the outer shell is between one to four, the compound has positive valency.