5. Periodic Classification of Elements Class 10 Science [LATEST] Solutions Chapter Review in English - CBSE Study
NCERT Solutions for Class 10 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 5. Periodic Classification of Elements with detailed explanations and step-by-step answers for better exam preparation. Each Chapter Review is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 10 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 10 English Medium Science All Chapters:
5. Periodic Classification of Elements
1. Chapter Review
Chapter Review:
- Groups having three elements each. So he called these groups called triads.
- According to Dobereiner's Traids "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".
- According to Newlands’ Law of Octaves "Every eighth element repeat the properties of the first element".
- Newlands’ Law of Octaves worked well with lighter elements only.
- When Mendeleev started work on Periodic Table, oniy 63 elements were known.
- The Modern Periodic Table has 18 vertical columns known as ‘groups’
and 7 horizontal rows known as ‘periods’. - The Modern Periodic Law state that ‘Properties of elements are a periodic function of their atomic number.’
- The valency of an element is determined by the number of valence electrons present in the outermost shell of its atom.
- The atomic size may be visualised as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
- The atomic radius decreases in moving from left to right along a period. This is due to an increase in nuclear charge which tends to pull the electrons closer to the nucleus and reduces the size of the atom.
- Boron, silicon, germanium, arsenic, antimony, tellurium and polonium are intermediate in properties and are called metalloids or semi metals.
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