Question

what are the law of conservation of mass and explain Dalton theory and who was Neil Bohr define him​

Answer 1

Law of Conservation of Mass

The law of conservation of mass states that the mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another.

Dalton Theory

• Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.
• Dalton based his theory on the law of conservation of mass and the law of constant composition.
• The first part of his theory states that all matter is made of atoms, which are indivisible.
• The second part of the theory says all atoms of a given element are identical in mass and properties.
• The third part says compounds are combinations of two or more different types of atoms.
• The fourth part of the theory states that a chemical reaction is a rearrangement of atoms.
• Parts of the theory had to be modified based on the discovery of subatomic particles and isotopes.

Neil Bohr

Bohr was also a philosopher and a promoter of scientific research. Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another.