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CBSE NOTES ⇒ Class 10th ⇒ Science ⇒ 5. Periodic Classification of Elements

5. Periodic Classification of Elements

Newlands Law of Octaves


Chapter 5. Periodic Classification of Elements


  • 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.  

Dobereiner’s Triads: 

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). 

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. 

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.

 

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Study Materials List:

CBSE NOTES ⇒ Class 10th ⇒ Science
1. Chemical Reactions and Equations
2. Acids, Bases and Salts
3. Metals and Non-metals
4. Carbon and its Compounds
5. Periodic Classification of Elements
6. Life Processes
7. Control and Coordination
8. How do Organisms Reproduce
9. Heredity and Evolution
10. Light-Reflection and Refraction
11. Human Eye and Colourful World
12. Electricity
13. Magnetic Effects of Electric Current
14. Sources of Energy
15. Our Environment
16. Management of Natural Resources

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