Question

what do you mean by Dalton 's law of atomic theory?

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Answer 1

The postulate of Dalton's atomic theory is the result of the Law of conservation of mass:

⸻➤Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.

The postulate that explains the Law of definite proportion:

⸻➤Atoms combine in the ratio to small numbers to form compounds . In a compound, the relative number and kinds of atoms are constant.

According to Dalton's Atomic theory:

• Every element is composed of extremely small particles called atoms.
• Atoms of a given element are identical, both in mass and properties. Different chemical elements have different kinds of atoms; in particular, their atoms have different masses.
• Atoms cannot be created, destroyed or transformed into atoms of other elements.
• Compounds are formed when atoms of different elements combine with each other in small whole number ratios.
• The relative number and kinds of atoms in a given compound are constant .

Dalton 's theory have some drawbacks also as follows:

• According to modern theory , atom is not the ultimate indivisible particle of matter . Today , we know that atoms are divisible, i.e they are themselves made up of particles that are :- protons, electrons, neutrons, etc .
• In case of isotopes of an element, the assumption that the atoms of the same element have same mass does not hold good.

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Answer 2

Answer:

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.