In their latest clarification NCERT for its syllabus change has said that periodic table and evolution have not been removed from the school education curriculum but in fact are available in appropriate detail for students who opt for science in classes 11 and 12.
"Students pursuing science in classes 11 and 12 will study the details of Periodic Classification of elements (Periodic table). The content placed in the periodic table again have been made more age appropriate, more so considering the Covid pandemic situation," the official clarification from NCERT read.
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The move, which came to light after scientific journal Nature mentioned it in an article on Wednesday, sparked concerns from experts who described the periodic table as part of critical learning.
When it comes to rationalising the periodic table, NCERT said that the discussion about the basic concepts such as elements, symbols, formation of compounds, atoms and molecules have been dealt with in Class 9. In Class 10, chemical reaction, acids, bases and salts, metals and non-metals, carbon and its compounds have been covered, it added.
Add the mass of protons and neutrons to compute the atomic mass of a single atom of an element. Example: Find the atomic mass of a carbon isotope which has 7 neutrons. From the periodic table, you can see that carbon has an atomic number of 6, which is its proton number.
New Delhi: Chapters on the periodic table, challenges to democracy, and sustainable management of natural resources are among those dropped from Class 10 textbooks by the National Council for Education Research and Training (NCERT).
In a statement, the council rationalised the reduction by stating they wanted to reduce the content load on students in light of the COVID-19 pandemic. Defending its decision to chop off evolution and the periodic table, the council said that children may not have to study same concepts at different stages and it needs to be done at appropriate stage (sic).
NEW DELHI: A day after controversy over the alleged removal of the periodic table, sources of energy, and also key chapters on democracy from Class 10 textbooks, NCERT on Friday clarified that these have not been removed from the curriculum rather they are available in Classes 11 and 12.
A report, first published by Nature, stated that a chapter on evolution would be cut from the syllabus after people protested last month, but in addition to that the periodic table has also been dropped from the syllabus of class 10th. The report also mentioned that topics such as sources of energy and environmental sustainability have also been dropped.
The theory of evolution and the periodic table are not merely chapters in high school textbooks. They form a cornerstone of scientific knowledge, and their deletion from the curriculum is a disservice to the students in the country. Over 4,000 researchers have protested the exclusion of the theory of evolution in an open letter.
The periodic table stands as a testament to the countless hours of research, experimentation and collaboration conducted by scientists throughout history. Dmitri Mendeleev's breakthrough in organising the elements based on their atomic properties revolutionised our understanding of the natural world. It provides a framework that has allowed scientists to predict the existence of new elements, understand their behaviour, and unravel the intricacies of chemical reactions.
Collaboration between educators, scientists, and policymakers is paramount to address this issue. Science educators should emphasise the relevance and applicability of concepts such as evolution and periodic table in everyday life, making it more relatable and accessible to students. Moreover, initiatives such as science clubs, workshops, and public outreach programs can play a vital role in generating interest and enthusiasm for the subject.
The National Council of Educational Research and Training (NCERT) has reportedly dropped topics like the periodic classification of elements, democracy, political parties and challenges to democracies from class 10th textbooks.
After NCERT's decision last month to remove Charles Darwin's Theory of Evolution from Class 9 and Class 10 science textbooks, it has courted controversy once again by removing the periodic table from Class 10 textbooks.
Only students who elect to study chemistry in the final two years of education (before university) will learn about the periodic table. Students, though, can still learn about these subjects, but only if they opt for the relevant subject in Class 11 and Class 12.
The NCERT has made the deletion of Chapter 5 on the periodic classification of elements and Chapter 9 on Charles Darwin's theory of evolution, including topics such as the origin of life on Earth, human evolution, and heredity, permanent.
As part of this exercise, approximately 30% of the syllabus was deleted for Classes 6 to 12. The temporary exclusion of certain topics, including those related to the periodic table and Darwin's theory, was intended to streamline the curriculum during these challenging times.CONCERNS OF SCIENTISTS AND TEACHERS
However, the permanent removal of these scientific topics has raised concerns among scientists and teachers. The periodic table forms the foundation of chemistry education, providing a systematic understanding of elements and their properties. Its exclusion from the Class 10 syllabus can hinder students' grasp of essential chemical principles.
Question 1. What is the basic theme of organisation in the periodic table?
Answer: The basic theme of organisation of elements in the periodic table is to simplify and systematize the study of the properties of all the elements and millions of their compounds. This has made the study simple because the properties of elements are now studied in form of groups rather than individually.
Question 2. Which important property did Mendeleev use to classify the elements in this periodic table and did he stick to that?
Answer: Mendeleev used atomic weight as the basis of classification of elements in the periodic table. He did stick to it and classify elements into groups and periods.
Question 4. On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.
Answer: The sixth period corresponds to sixth shell. The orbitals present in this shell are 6s, 4f, 5p, and 6d. The maximum number of electrons which can be present in these subshell is 2 + 14 + 6 + 10 = 32. Since the number of elements in a period corresponds to the number of electrons in the shells, therefore, sixth period should have a maximum of 32 elements.
Question 6. Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
Answer: The element is chlorine (Cl) with atomic number (Z) = 17.
Question 27. Use periodic table to answer the following questions:
(a) Identify the element with five electrons in the outer subshell.
(b) Identify the element that would tend to lose two electrons.
(c) Identify the element that would tend to gain two electrons.
Answer: (a) Element belonging to nitrogen family (group 15) e.g., nitrogen.
(b) Element belonging to alkaline earth family (group 2) e.g., magnesium.
(c) Element belonging to oxygen family (group 16) e.g., oxygen.
Question 33. In the modem periodic table, the period indicates the value of
(a)atomic number (b) mass number (c) principal quantum number (d) azimuthal quantum number?
Answer: In the modern periodic table, each period begins with the filling of a new shell. Therefore, the period indicates the value of principal quantum number. Thus, option (c) is correct.
Question 34. Which of the following statements related to the modem periodic table is incorrect?
(a) The p-block has six columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell.
(b) The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.
(c) Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
(d) The block indicates value of azimuthal quantum number (l)for the last subshell that received electrons in building up the electronic configuration.
Answer: Statement (b) is incorrect.
Question 7. What are horizontal rows and vertical columns of the periodic table called?
Answer: Horizontal rows are called periods and vertical columns are called groups.
Question 1. Discuss the main features of long form of the periodic table. What are the advantages of long . form of periodic table?
Answer: Main features of long form of periodic table:
Question 2. Discuss the main characteristics of four blocks of elements in the periodic table? Give their general electronic configuration.
Answer: s-block elements:
Question 4. Discuss the factors that influence the magnitude of ionization enthalpy. What are the general trends of variation of ionization enthalpy in the periodic table? Explain.
Answer: Factors affecting Ionization enthalpy.
He said NCERT has taken the approach of removing topics on our father of the nation Mahatma Gandhi, Maulana Azad, and other topics related to the country's common history, the theory of evolution, the periodic table, democratic values and the current challenges faced by the country.
Class 10 students in the CBSE board will no longer have to study the periodic table, democracy, and sources of energy in their NCERT textbooks. The latest move comes after the removal of the theory of evolution from curriculum. ff782bc1db
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