Question

Atomic Structure
1. State the main postulates of - Dalton's atomic theory. Explain how the modern atomic theory
contradicted Dalton's atomic theory.​

Answer 1

Answer:The main postulates of theory are :

Matter consists of small indivisible particles called – atoms i. e. Atom is the basic unit of matter. ... Atom can neither be created nor destroyed. Atoms combine with other atoms in simple whole number ratio forming compounds or molecules.

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Answer 2

The postulates of Dalton's Atomic Theory are-

1. Atoms are the smallest particle of an element
2. Atoms can neither be created nor be destroyed in a chemical reaction.
3. All atoms of the same element has same size, mass and properties.
4. Atoms of different elements have different sizes, masses and properties.
5. Atoms combine in small simple whole numbers to form molecules.

Contradictions of the atomic theory

1. Atoms are not the smallest particle of an element. Atoms are composed of electrons, protons, and neutrons.
2. All atoms of same element do not have same masses. ( isotopes )
3. Atoms of different elements may have same masses. ( isobars )
4. Atoms may also combine in complex numbers to form molecules. For example, sucrose.

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