Which part(s) of Dalton's atomic theory have been proven to be incorrect?

Question

BlackTom AI · Accepted Answer

Question recap: Which part(s) of Dalton's atomic theory have been proven to be incorrect?

Option 1: 'Atoms are indivisible and indestructible.' This statement is one of Dalton's classic postulates, but modern science shows atoms can be divided into subatomic particles (protons, neutrons, electrons), so this claim is incorrect. It reflects the historical idea of indivisibility, which does not hold up under evidence from electron discovery and nuclear physics.

Option 2: 'Matter is composed of extremely small particles called atoms.' This is a foundational idea that remains true in modern chemistry; atoms do exist as basic units of matter, so this statement is true and not a source of error in Dalton’s theory.

Option 3: 'Different atoms combine in simple whole-number ratios to form compounds.' This aligns with the law of multiple proportions and the idea that compounds form from discrete units in definite ratios; while refined with more modern understanding, the core concept of fixed, simple ratios still holds for many compounds. This statement is broadly true and not one of the incorrect postulates identified by modern science.

Option 4: 'In a chemical reaction, atoms are separated, combined, or rearranged.' This describes the conservation and rearrangement of atoms during reactions, which remains true in chemistry; atoms are not created or destroyed in ordinary chemical changes, only rearranged. This is a correct principle and not a rejected postulate.

Option 5: 'Atoms of a specific element are different from those of another element.' This captures the idea that elements have distinct atoms; while isotopes show variation in mass among atoms of the same element, the statement as written correctly contrasts atoms from different elements. This is still a valid general principle and not a rejected postulate.

Option 6: 'Atoms of a given element are identical in size, mass, and chemical properties.' This directly contradicts modern findings: isotopes demonstrate that atoms of the same element can have different masses, and there are variations in atomic behavior due to nuclear properties. Therefore, this statement is incorrect.

In summary, the statements identified as incorrect are those claiming atoms are indivisible (Option 1) and that atoms of a given element are identical in size, mass, and chemical properties (Option 6). The other options describe concepts that are either still true or only partially refined but not fundamentally disproven by modern science.

Which part(s) of Dalton's atomic theory have been proven to be incorrect?多项选择题

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