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Chapters
2: Motion
3: Fluids
4: Electric charge and Electric current
5: Magnetism and Electromagnetism
6: Light
7: Heat
8: Sound
9: Universe
10: Matter Around Us
11: Atomic Structure
▶ 12: Periodic Classification of Elements
13: Chemical Bonding
14: Acids, Bases and Salts
15: Carbon and its Compounds
16: Applied Chemistry
17: Animal Kingdom
18: Organisation of Tissues
19: Plant Physiology
20: Organ Systems in Animals
21: Nutrition and Health
22: World of Microbes
23: Economic Biology
24: Environmental Science
25: Computer – LibreOffice Impress
![Samacheer Kalvi solutions for Science [English] Class 9 TN Board chapter 12 - Periodic Classification of Elements - Shaalaa.com](/images/science-english-class-9-tn-board_6:5f2b1b2038084cf381bfa42c826a928c.jpg "Samacheer Kalvi solutions for Science [English] Class 9 TN Board chapter 12 - Periodic Classification of Elements")
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Solutions for Chapter 12: Periodic Classification of Elements
Below listed, you can find solutions for Chapter 12 of Tamil Nadu Board of Secondary Education Samacheer Kalvi for Science [English] Class 9 TN Board.
Samacheer Kalvi solutions for Science [English] Class 9 TN Board 12 Periodic Classification of Elements Exercise [Page 146]
Choose the correct answer.
If Dobereiner is related with ‘law of triads’, then Newlands is related with ______.
Modern periodic law
Hund’s rule
Law of octaves
Pauli’s Exclusion principle
Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their ______.
atomic numbers
atomic masses
similarities
anomalies
Elements in the modern periodic table are arranged in ______groups and______ periods.
7, 18
18, 7
17, 8
8, 17
Fill in the blanks.
In Dobereiner’s triads, the atomic weight of the middle element is ______ the of the atomic masses of 1st and 3rd elements.
Noble gases belong to______ group of the periodic table.
The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ______.
Example for liquid metal is ______.
Match the following.
| 1. | Triads | Newlands |
| 2. | Alkali metal | Calcium |
| 3. | Law of octaves | Henry Moseley |
| 4. | Alkaline earth metal | Sodium |
| 5. | Modern Periodic Law | Dobereiner |
State whether true or false. If false, correct the statement.
Newlands’ periodic table is based on atomic masses of elements and modern periodic table is based on atomic number of elements.
True
False
State whether true or false. If false, correct the statement.
Metals can gain electrons.
True
False
State whether true or false. If false, correct the statement.
Alloys bear the characteristics of both metals and nonmetals.
True
False
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
True
False
State whether true or false. If false, correct the statement.
Group 17 elements are named as Halogens.
True
False
Statement: Elements in a group generally possess similar properties but elements along a period have different properties.
Reason: The difference in electronic configuration makes the element differ in their chemical properties along a period.
Statement is true and reason explains the statement.
Statement is false but the reason is correct.
Answer the following.
State modern periodic law.
What are groups and periods in the modern periodic table?
What are the limitations of Mendeleev's periodic table?
State any five features of modern periodic table.
Solutions for 12: Periodic Classification of Elements
Samacheer Kalvi solutions for Science [English] Class 9 TN Board chapter 12 - Periodic Classification of Elements
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Concepts covered in Science [English] Class 9 TN Board chapter 12 Periodic Classification of Elements are History of Periodic Table: Early Attempts at the Classification of Elements, Dobereiner’s Triads, Newland's Law of Octaves, Mendeleev’s Periodic Table, Merits and Demerits of Mendeleev’s Periodic Table, Modern Periodic Law, The Modern Periodic Table, Advantage and Disadvantage of Modern Periodic Table, Structure of the Modern Periodic Table, Periodic Properties, Alloy, Metallic and Non-metallic Characters, Metalloid Character.
Using Samacheer Kalvi Science [English] Class 9 TN Board solutions Periodic Classification of Elements exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Samacheer Kalvi Solutions are essential questions that can be asked in the final exam. Maximum Tamil Nadu Board of Secondary Education Science [English] Class 9 TN Board students prefer Samacheer Kalvi Textbook Solutions to score more in exams.
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