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NCERT Solutions for class 10 Science Chapter 5- Periodic Classification Of Elements
NCERT Class 10 Science Chapter 5- Periodic Classification of Elements is categorized under Unit Chemical Substances – Nature and behavior. This unit, on the whole, comprises of 25 marks in the board exam, most compared to any chapter in the syllabus, hence all chapters in Unit Chemical Substances needs to be studied thoroughly. Periodic classification of elements chapter alone holds up 5 marks in the board exam as expected and from a careful analysis of previous question papers.
List of subtopics covered in Chapter 5 – Periodic Classification Of Elements:
|5.1||Making order out of chaos-Early attempts at the classification of elements|
|5.1.2||Newland’s Law of octaves|
|5.2||Making order out of chaos- Mendeleev’s Periodic Table|
|5.2.1||Achievements of Mendeleev’s Periodic Table|
|5.2.2||Limitations of Mendeleev’s Classification|
|5.3||Making order out of chaos-The Modern Periodic table|
|5.3.1||Position of elements in the modern periodic table|
|5.3.2||Trends in the modern periodic table|
List of Exercise with questions
Number – 5.1 – Making order out of chaos 3 Question ( 2 long, 1 short)
-Early attempts at the classification of elements
Number – 5.2 – Making order out of chaos
– Mendeleev’s Periodic Table 4 Question ( 1 long, 3 short)
Number – 5.3 – Making order out of chaos
-The Modern Periodic table 6 Question ( 1 long, 5 short)
Exercise Solutions – 10 Question ( 2 long, 8 short)
NCERT Solutions for class 10 Science Chapter 5 – Periodic Classification of Elements
Periodic Classification of elements gives a brief idea about how elements are classified based on the similarities in the properties shared by different elements. It briefly discusses how Dobereiner classified various elements into triads and how Newland proposed the Law of Octaves. The chapter briefly discusses arrangement if elements in increasing order of their atomic numbers and chemical properties as suggested by Mendeleev, as he even predicted the existence and presence of some more elements that are to be discovered yet which he arrived at due to gaps in the Periodic table.
The chapter also talks about the limitations of Mendeleev’s classification and hence the modern periodic table. It gives an idea of the positioning of elements in the modern periodic elements and also the vertical and horizontal arrangement known as groups and periods respectively.
Key Features of NCERT Solutions for class 10 Science Chapter 5 – Periodic Classification Of Elements
- NCERT class 10 science solutions are answered considering chapterwise marks distribution and question type aligning with the CBSE blueprint
- Solutions have been elaborated enabling students to better understand
- Numerical have been solved giving a step-by-step explanation
- Tabular columns have been used wherever necessary which enables students to learn at a faster pace.
- The language used in the chapter is simplified and logical.
Frequently Asked Questions on Periodic Classification Of Elements
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves ?
Döbereiner’s triads did exist in the columns of Newlands’ Octaves; For example, the elements
Lithium (Li), Potassium (K) and Sodium (Na) constitute a Dobereiner’s Triad but are also found in the second column of Newland’s Octaves.
Besides gallium, which other elements have since been discovered that were left by Mendeléev in his Periodic Table ?
Germanium and Scandium are the element that are left by Mendeleev in his Periodic Table since its discovery.
What were the criteria used by Mendeléev in creating his Periodic Table?
Mendeléev concentrated on various compounds formed by the elements with Hydrogen and
Oxygen. Among physical properties, he observed the relationship between the atomic masses
of various elements while creating his periodic table.
Why do you think the noble gases are placed in a separate group ?
Noble gases are placed in a separate group because of their inert nature and low concentration in our atmosphere. They are kept in a separate group called Zero group so that they don’t disturb the existing order.
In the Modern Periodic Table, which are the metals among the first ten elements?
Lithium and Beryllium are the metals among the first ten elements in Modern Periodic Table.
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table ?
The number of valence electrons decides an atom’s position in the periodic table while the electronic configuration decides the number of valence electrons.