Chapter 3: Problem 14

Of the five parts of Dalton's atomic theory, which one (s) have been modified?

Short Answer

Expert verified

The second and third postulates of Dalton's atomic theory have been modified.

Step by step solution

Identification of Modified Postulates

First, identify the original postulates of Dalton's atomic theory. These were: 1) Elements are made of extremely small particles called atoms; 2) Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties; 3) Atoms cannot be subdivided, created, or destroyed; 4) Atoms of different elements combine in simple whole-number ratios to form chemical compounds; 5) In chemical reactions, atoms are combined, separated, or rearranged.

Comparing with Current Understanding of Atomic Theory

Next, compare these to our current understanding of atomic theory. From this comparison, it can be seen that the second and third postulates have been modified. We now know that atoms of a given element may not be identical due to the presence of isotopes. Moreover, atoms can be subdivided into protons, neutrons, and electrons, which contradicts Dalton's third postulate.

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Of the five parts of Dalton's atomic theory, which one (s) have been modified?

Short Answer

Step by step solution

Identification of Modified Postulates

Comparing with Current Understanding of Atomic Theory

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