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Get CBSE Notes for Class 10 Science Chapter 5. Periodic Classification of Elements: Newlands Law of Octaves prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 10 students who want clear, structured, and exam-oriented notes for CBSE Science.
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.
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:
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.
Every eighth element had properties similar to that of the first. This law is known as 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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