5. Periodic Classification of Elements Class 10 Science [LATEST] Solutions Additional Questions With Solutions 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 Additional Questions With Solutions 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
5. Additional Questions With Solutions
Additional Questions With Solutions
Question 1. Write the main features of Mendeleev's periodic table.
Answer: Mendeleev arranged the elements in a horizontal row in the order of their increasing atomic mass. Elements with similar properties were placed in all the vertical pillars. Following are the main features of this table:-
(a) Groups and Subgroups:- There are 8 groups in the periodic table. Groups I to VII are divided into two subgroups.
(b) The number of periods in the periodic table is 7 which are known as 1,2,3,4,5,6 and 7.
1st period - 2 elements
Second Period - 8 Elements
Third Period - 8 Elements
Fourth Period - 18 Elements
Fifth Period - 18 Elements
Sixth Period - 32 Elements
seventh period - incomplete period
Question 2: Write some characteristic features of the periodic table.
Answer: Some of the distinctive features of the periodic table are as follows:-
(i) Elements are placed in a special way in groups and periods than before.
(ii) The properties of many elements were inferred from this type of classification.
(iii) The atomic masses of many elements were modified.
(iv) The possibility of discovery of new elements increased and new elements were also discovered.
Question 3 - Differentiate between modern periodic table and Mendeleev's periodic table.
Answer -
Modern periodic table
1. Elements are arranged in increasing atomic number.
2. This periodic table has 18 vertical columns and 7 horizontal rows.
3. Isotopes of elements are placed at the same place as their corresponding elements because they have the same atomic number.
4. Chemically dissimilar elements are kept in separate groups.
Mendeleev's periodic table
1. Elements are arranged in increasing atomic masses.
2. This periodic table has 8 vertical columns and 6 horizontal rows.
3. The isotopes of the elements are not found in proper positions.
4. Chemically dissimilar elements held together.
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