Question
Download Solution PDFWhen did John Dalton publish a paper titled 'A New System of Chemical Philosophy' describing principles such as the uniqueness of atoms of the same element, relative atomic mass and the laws of chemical combination?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 1808.Key Points
- In 1808, John Dalton publish a paper titled 'A New System of Chemical Philosophy' describing principles such as the uniqueness of atoms of the same element, relative atomic mass and the laws of chemical combination.
- John Dalton raised the atomic theory that acted as an explanation of the following two laws.
-
Law of conservation of mass –
-
According to the law, mass can neither be destroyed nor created in any chemical reaction.
-
-
Law of constant proportion/ definite proportion –
-
The laws state that in a chemical substance, the elements are always present in certain proportions by mass.
-
- Atom:
- An atom is the smallest invisible unit of matter that constitutes a chemical element.
- Every plasma, solid, gas & liquid, is composed of ionized or neutral atoms.
- Around 100 picometers across, atoms are extremely small.
- Atomic theory:
- John Dalton discovered atomic theory.
- As per the theory, all matter whether it is a mixture, compound, element, is consists of invisible particles called ‘atoms’.
Last updated on May 28, 2025
-> SSC JE notification 2025 for Civil Engineering will be released on June 30.
-> Candidates can fill the SSC JE CE application from June 30 to July 21.
-> The selection process of the candidates for the SSC Junior Engineer post consists of Paper I, Paper II, Document Verification, and Medical Examination.
-> Candidates who will get selected will get a salary range between Rs. 35,400/- to Rs. 1,12,400/-.
-> Candidates must refer to the SSC JE Previous Year Papers and SSC JE Civil Mock Test, SSC JE Electrical Mock Test, and SSC JE Mechanical Mock Test to understand the type of questions coming in the examination.
-> The Staff Selection Commission conducts the SSC JE exam to recruit Junior Engineers in different disciplines under various departments of the Central Government.