![]() More than 1,800 scientists and educators had written an open letter expressing concern over the rationalisation exercise. The move has led to severe backlash from scientists and experts. Full chapters on democracy, challenges to democracy and political parties have also been dropped for Class 10 students after the latest revision. It rationalised the contents on certain criteria, which included overlapping with similar content, similar content included in the lower or higher class in the same subject, high difficulty level, content, which is easily accessible to children and does not require much intervention from the teachers and can be learnt through self-learning or peer-learning, content, which is not relevant in the present context or is outdated, learning outcomes already developed across the classes are taken care of in this rationalization exercise.Īmong the topics dropped from the science textbook are also chapters on environmental sustainability and sources of energy. NCERT said that it attempted to rationalise the contents of the textbooks in 2021 as teaching-learning was done using alternative modes. In class 10, chemical reaction acids, bases and salts metals and non-metals carbon and its compounds have been covered. Regarding rationalization of the periodic table, NCERT said that the discussion about basic concepts such as elements, symbols, formation of compounds, atoms and molecules have been dealt with in class 9. Only students who elect to study chemistry in the final two years of education (before university) will learn about the periodic table. Meyer formed his periodic law based on the atomic volume or molar volume, which is the atomic mass divided by the density in solid form.In India, Class 10 is the last year in which science is taught as a compulsory subject. ![]() They both arranged the elements by their mass and proposed that certain properties periodically reoccur. Mendeleev created the first periodic table and was shortly followed by Meyer.
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