Study Materials: CBSE Notes

Here we learn chapter 5 notes class 10 science Periodic Classification of Elements in which notes like Dobereiner’s Triads, Newlands Law of Octaves, Limitation of Newland’s Law of octaves and example of Dobereiner’s Triads.

Notes ⇒ Class 10th ⇒ Science ⇒ 5. Periodic Classification of Elements

# Notes 5. Periodic Classification of Elements - Newlands Law of Octaves | Class 10 Science - Toppers Study

Topper Study classes prepares CBSE Notes on practical base problems and comes out with the best result that helps the students and teachers as well as tutors and so many ecademic coaching classes that they need in practical life. Here we learn chapter 5 notes class 10 science Periodic Classification of Elements in which notes like Dobereiner’s Triads, Newlands Law of Octaves, Limitation of Newland’s Law of octaves and example of Dobereiner’s Triads.

## Notes 5. Periodic Classification of Elements - Newlands Law of Octaves | Class 10 Science - Toppers Study

CBSE board students who preparing for class 10 ncert solutions maths and Science solved exercise chapter 5. Periodic Classification of Elements available and this helps in upcoming exams 2023-2024.

### You can Find Science solution Class 10 Chapter 5. Periodic Classification of Elements

• All Chapter review quick revision notes for chapter 5. Periodic Classification of Elements Class 10
• NCERT Solutions And Textual questions Answers Class 10 Science
• Extra NCERT Book questions Answers Class 10 Science
• Importatnt key points with additional Assignment and questions bank solved.

Chapter 5 Science class 10

### Newlands Law of Octaves class 10 Science Chapter 5. Periodic Classification of Elements

• Newlands Law Of Octaves
• What Is The Law Of Octaves
• The Law Of Octaves
• Octaves Law
• Octave Law
• Newlands Octaves Law
• Law Of Octaves
• Limitation Of Newland’s Law Of Octaves
• Notes Class 10 Chapter 5

## Chapter 5. Periodic Classification of Elements

### What is periodic classification of elements?

The periodic classification of elements is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus), electron configurations, and recurring chemical properties. The periodic table is a chart that shows how elements are related to one another.

• The classification of elements mean keeping them systemically into various groups on the basis of their properties.
• First time, elements are classified into metals and non-metals.

### What are Dobereiner's Traids?

Dobereiner made a triads of three elements to arrange the elements with similar properties into groups. the three elements in a triad were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.

For example: lithium (Li), sodium (Na) and potassium (K).

Dobereiner discovered three such triads are as follow:

1. lithium (Li), sodium (Na) and potassium (K).
2. Calcium (Ca) Strontium (Sr) and Barium (Ba).
3. Chlorine (Cl) Bromine (Br) and Iodine (I).

These elements are arranged downwards in order of increasing atomic masses, They will show this law.

According to this law, when three elements in a triad were written in order of increasing atomic masses, the atomic mass of  the middle element was roughly the average of the atomic masses of the other two elements. Such a triad is known as Dobereiner's triads.

### Limitation/Backwards of Dobereiner's Law:

1. Döbereiner could identify only three triads from the elements known at that time.

## Newland’s Law of Octaves:

Every eighth element had properties similar to that of the first. This law is known as Newland’s Law of Octaves.

### Limitation of Newland’s Law of octaves:

(i) It was found that the law of octaves was applicable only up to calcium.

(ii) No more elements would be discovered in the future instead of 56 known elements, it was assumed by Newlands. But did not match the properties of new discovered elements to this law.

(iii) Newland’s Law of Octaves worked well with lighter elements only.