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The history of the periodic table is also a history of the discovery of the chemical elements. The first person in recorded history to discover a new element was Hennig Brand, a bankrupt German merchant. Brand tried to discover the philosopher's stone—a mythical object that was supposed to turn inexpensive base metals into gold.
Heinemann, 1st Ed 1931, 10th Ed. 1960; Description: Unique very advanced and comprehensive coverage of every element known at the time by chapter describing all known compounds yet discovered or synthesised. Approaches chemistry as the study of elements and compounds without the later emphasis on bond theory and analysis.
The protoscience of chemistry, alchemy, was unsuccessful in explaining the nature of matter and its transformations. However, by performing experiments and recording the results, alchemists set the stage for modern chemistry. The history of chemistry is intertwined with the history of thermodynamics, especially through the work of Willard Gibbs.
Chemistry is the scientific study of the properties and behavior of matter. It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
Sir Shanti Swarup Bhatnagar OBE, FNI, FASc, [2] FRS, [1] FRIC, FInstP (21 February 1894 – 1 January 1955) was an Indian colloid chemist, academic and scientific administrator. The first director-general of the Council of Scientific and Industrial Research (CSIR), Bhatnagar is revered as the Father of Research Laboratories in India. [3]
Jnan Chandra Ghosh. Signature. Sir Prafulla Chandra Ray, CIE, FNI, FRASB, FIAS, FCS (also spelled Prafulla Chandra Rây and Prafulla Chandra Roy; Bengali: প্রফুল্ল চন্দ্র রায় Praphulla Chandra Rāy; 2 August 1861 – 16 June 1944) [2] was an Indian chemist, educationist, historian, industrialist and ...
www .cbse .gov .in. The Central Board of Secondary Education ( CBSE) is a national level board of education in India for public and private schools, controlled and managed by the Government of India. Established in 1929 by a resolution of the government, the Board was an experiment towards inter-state integration and cooperation in the sphere ...
This unit is defined as a twelfth of the mass of a free neutral atom of carbon-12, which is approximately 1.66 × 10 −27 kg. Hydrogen-1 (the lightest isotope of hydrogen which is also the nuclide with the lowest mass) has an atomic weight of 1.007825 Da. [60] The value of this number is called the atomic mass .