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# NCERT Solutions for Class 10 Science Chapter 5 – Periodic Classification of Elements

NCERT Solutions for Class 10 Science Chapter 5 – Periodic Classification of Elements offers a systematic solution to all the questions asked in chapter 5. This chapter tells you the methodical approach to classify all the elements known to us in a table according to the properties shown by them. The chapter starts its discussion with the attempts of arranging the known elements in earlier times by several scientists and how the process evolved to the establishment of the modern periodic table of elements. It also tells you how the elements thus arranged show periodicity of properties including atomic size, valency or combining capacity and metallic and non-metallic character.

There are a total of 10 questions in the exercise given at the end of NCERT Solutions for Class 10 Science Chapter 5 is based on trends seen across the elements in a period and a column. Other questions ask you to predict the different attributes related to atoms like the atomic number, atomic size etc. based on given information like electronic configuration of an atom. Some questions deal with the comparison between elements.

The solutions for the questions asked in NCERT Solutions for Class 10 Science Chapter 5 – Periodic Classification of Elements cover all concepts in detail and help you become thorough with all topics and subtopics of the chapter. The solutions given provide an ample amount of practice required for remembering the periodic table and properties associated with it.

## NCERT Class 10 Science Chapter 5  Periodic Classification of Elements

Our comprehensive solutions cover all concepts of CBSE NCERT Class 10 Science Chapter 5 in detail. This is very important from the Science board exam perspective. Some of the important topics and subtopics covered in this chapter have been given below.

• Early Attempts at the Classification of Elements

This part of the NCERT Solutions for Class 10 Science Chapter 5- Periodic Classification of Elements gives you an insight into the efforts done by early age scientists to arrange the elements in a particular order. It tells you how Döbereiner, a German chemist, grouped the elements into triads and how later on Newlands, a British scientist, came up with the Law of Octaves.

• Mendeleev’s Periodic Table

This portion of the chapter tells you about the most significant contribution in the early development of the periodic table by a Russian chemist, Dmitri Mendeleev who arranged the elements in increasing order of their atomic masses and according to their chemical properties.

• Achievements and limitations of Mendeleev’s Periodic Table

This part of the NCERT CBSE Class 10 Science Chapter 5 tells you that Mendeleev predicted the existence of some yet to be discovered elements based on gaps in his periodic table and places for noble elements were also appreciated in his table.

Further, you learn about the limitations of Mendeleev’s periodic table, the most critical being inability to assign a place to hydrogen. Other limitations include the absence of a suitable explanation for isotopes and irregular increase in atomic masses in going from one element to the next.

• The Modern Periodic Table

This part of CBSE NCERT Class 10 Science Chapter 5 tells you that Henry Moseley, in 1913, established the fact that the atomic number of an element is a more fundamental property.

It further mentions that the arrangement of elements in order of increasing atomic number helped in removing the anomalies of arranging elements based on increasing atomic mass. This chapter also tells you that 118 elements in the modern periodic table are arranged in 18 vertical columns called groups and 7 horizontal rows called periods. Elements thus arranged show periodicity of properties. Here you will also learn about the location of an element in the periodic table and how it indicates about its chemical reactivity.

• Trends in the Modern Periodic Table

This part of the Class 10 Science Periodic Classification of Elements discusses the common trends seen in the periodic table. It teaches you that the valency of an atom can be determined by the number of valence electrons present in the outermost shell of an atom.

You will also learn that the atomic radius decreases in moving from left to right in a period and increases going down in a column. This chapter explains in detail how metallic properties decrease across a period and increase down a group.

### NCERT CBSE Class 10 Science Chapter 5 Exercise-Discussion

Our NCERT Solutions for Class 10 Science Chapter 5- Periodic Classification of Elements answers in details all questions of the exercise given at the end of the chapter. the exercise contains 10 questions that cover all sections of the chapter

• Question 1 asks you to identify the correct statement about trends across a period.
• Questions 2 and 3 of exercise given in NCERT CBSE Class 10 Science Chapter 5 ask you to identify the elements through the properties provided.
• Question 4 asks you to tell the common properties shown by elements of boron and fluorine groups.
• Questions 5 and 7 ask you to deduce answers for the questions asked, utilizing the given information on electronic configuration.
• Question 6 asks you to use your knowledge about the properties of group 16 and 17 elements.
• Question 8 is a direct question asking you about the relation of the electronic configuration of an atom to its position in the periodic table.
• Question 9 is a question based on the application of the concept of similar properties of elements in a group.
• Question 10 asks you to compare Mendeleev’s periodic table with the modern periodic table.

### Benefits of NCERT Solutions for Class 10 Science Chapter 5 – Periodic Classification of Elements

There are several advantages associated with learning from our all-encompassing, yet to the point, NCERT Solutions drafted by expert science teachers. Some of them have been mentioned below.

• NCERT Class 10 Science Chapter 5 – Periodic Classification of Elements are based on the latest CBSE and NCERT curriculum.
• Our NCERT Solutions answer all these questions using the best methods of solving these questions.
• They include detailed explanations and relevant examples to help you learn efficiently.
• These are easy to understand and remember.
• They help you in revising the contents of the chapter thoroughly during your exams and score more marks in class 10th board exams.
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