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.
Officials at the council said that the topic was removed when it rationalised the syllabus by 30% to "reduce content load on students" in view of the Covid-19 pandemic in 2022. The changes were reflected in new textbooks published earlier this year.
According to the list of rationalised content released by the council in June last year, a chapter titled "Periodic Classification of Elements" was dropped from the science textbook of Class 10. However, the Class 11 chemistry textbook still has a chapter titled "Classification of Elements and Periodicity in Properties" that traces the history of the development of the periodic table of elements.
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