What is valency?

Education Journalist | Study Abroad Lead

Valency is a concept in chemistry that refers to the number of chemical bonds a particular element can form with other elements. Valency is defined as the maximum number of electrons that an atom of an element can acquire or lose, gain or share to form a chemical bond.

The valency of an element is used to predict the formula of a compound that can be formed by combining the element with other elements.
It helps to determine the type of chemical bond that is likely to form between the elements.
Valency plays a crucial role in chemical reactions and in the structure of molecules and compounds.

For example, the valency of carbon is 4, meaning it can form 4 chemical bonds with other atoms. This is why it is often found in molecules such as methane (CH₄) and ethane (C₂H₆).

The valency of oxygen is 2, so it can form 2 bonds, such as in water (H₂O).

Valency

Also Read:

Related Topics
Atomic and Molecular Masses	Carbon and Its Compound	Find Atomic Mass
Limitations of Bohr’s Model	Versatile Nature of Carbon	Bohr Radius
Nucleus of an Atom Force	Structure of Atom	Periodic Classification of Elements

CBSE CLASS XII Related Questions

1.
Draw the structures of major monohalo products in each of the following :
(a)
(b)

View Solution

2.
A reaction \( \mathrm{A \rightarrow B} \) follows second order kinetics. How will the rate of reaction be affected if the concentration of (i) A is increased by three times, and (ii) A is reduced to half ?

View Solution

3.
Explain the Finkelstein reaction.

View Solution

4.
(i) Give a chemical test to distinguish between Propanal and Propanone.
(ii) Which of the given acids is stronger and why ? \( \mathrm{F_3C{-}C_6H_4{-}COOH} \) or \( \mathrm{H_3C{-}C_6H_4{-}COOH} \)
(iii) Complete the given reaction sequence :
\[ \mathrm{CH_3CH_2CH_2COOC_2H_5} \xrightarrow{\mathrm{NaOH}} \mathrm{A + C_2H_5OH} \]
\[ \mathrm{A} \xrightarrow{\mathrm{H_3O^+}} \mathrm{B} \]

View Solution

5.
(i) A first order reaction is 20% complete in 10 minutes. Calculate the time taken when 80% of the reaction will be completed.
[Given : log 5 = 0.7, log 4 = 0.6]
(ii) For a chemical reaction \( \mathrm{R \rightarrow P} \), variation in \( \ln[\mathrm{R}] \) vs. time (t) graph is given below :
(I) Predict the order of the reaction.
(II) Write the slope of the curve.

View Solution

6.
From the given data of \(E^{\circ}\) values, answer the following questions :
(I) Why \(E^{\circ}_{M^{2+}/M}\) show irregular trend in the above values ?
(II) Why is \(E^{\circ}_{Cu^{2+}/Cu}\) value exceptionally positive ?
(III) Why \(E^{\circ}_{Mn^{2+}/Mn}\) value is highly negative ?

View Solution

What is valency?

CBSE CLASS XII Related Questions

1.
Draw the structures of major monohalo products in each of the following :
(a)
(b)

2.
A reaction \( \mathrm{A \rightarrow B} \) follows second order kinetics. How will the rate of reaction be affected if the concentration of (i) A is increased by three times, and (ii) A is reduced to half ?

3.
Explain the Finkelstein reaction.

6.
From the given data of \(E^{\circ}\) values, answer the following questions :
(I) Why \(E^{\circ}_{M^{2+}/M}\) show irregular trend in the above values ?
(II) Why is \(E^{\circ}_{Cu^{2+}/Cu}\) value exceptionally positive ?
(III) Why \(E^{\circ}_{Mn^{2+}/Mn}\) value is highly negative ?

Comments

SUBSCRIBE TO OUR NEWS LETTER

What is valency?

CBSE CLASS XII Related Questions

1.Draw the structures of major monohalo products in each of the following :(a)(b)

2.A reaction \( \mathrm{A \rightarrow B} \) follows second order kinetics. How will the rate of reaction be affected if the concentration of (i) A is increased by three times, and (ii) A is reduced to half ?

3.Explain the Finkelstein reaction.

6.From the given data of \(E^{\circ}\) values, answer the following questions : (I) Why \(E^{\circ}_{M^{2+}/M}\) show irregular trend in the above values ? (II) Why is \(E^{\circ}_{Cu^{2+}/Cu}\) value exceptionally positive ? (III) Why \(E^{\circ}_{Mn^{2+}/Mn}\) value is highly negative ?

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Draw the structures of major monohalo products in each of the following :
(a)
(b)

2.
A reaction \( \mathrm{A \rightarrow B} \) follows second order kinetics. How will the rate of reaction be affected if the concentration of (i) A is increased by three times, and (ii) A is reduced to half ?

3.
Explain the Finkelstein reaction.

6.
From the given data of \(E^{\circ}\) values, answer the following questions :
(I) Why \(E^{\circ}_{M^{2+}/M}\) show irregular trend in the above values ?
(II) Why is \(E^{\circ}_{Cu^{2+}/Cu}\) value exceptionally positive ?
(III) Why \(E^{\circ}_{Mn^{2+}/Mn}\) value is highly negative ?