A century and a half ago, a Russian chemistry professor published a classification of all the known elements, organized by atomic weight. Today, the system that he created for his students — plus some ...

The periodic table of elements—also known as Mendeleev’s table—was developed in 1869 by Russian chemist Dmitri Mendeleev. It organizes all known chemical elements by their atomic number, which is the ...

The name of Dmitrii Mendeleev is forever associated with the periodic table, which is found in chemistry laboratories and classrooms around the world. Yet this famous invention, which made sense and ...

Basic sciences - chemistry, physics, mathematics, and biology – allow us to understand natural phenomena and drive innovation. Investing in these disciplines is essential to create the tools we need ...

NCERT books offer a number of problems which students can practice to assess their learning and prepare for the examinations. Practicing a variety of questions helps to strengthen the fundamentals of ...