Question detail

How did knowledge of isotopes contribute to the understanding of atomic weight order?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

The periodic table

Question

A. It showed that atomic weights could vary due to different isotopes.
B. It proved that all elements have the same atomic weight.
C. It indicated that isotopes are irrelevant to atomic weight.
D. It established that atomic weight is solely based on protons.

Answer

The correct option is It showed that atomic weights could vary due to different isotopes..

Explanation

The correct option is It showed that atomic weights could vary due to different isotopes.. It showed that atomic weights could vary due to different isotopes. is correct because it directly supports the approved learning objective to explain how knowledge of isotopes helped explain why atomic weight order was not always correct. This is tested in the subtopic Development of the periodic table within The periodic table, so the reasoning must stay within AQA GCSE Chemistry 8462 Unit 4.1. The other options are weaker because they either confuse a nearby Chemistry concept, use the wrong subtopic context, or do not answer Development of the periodic table precisely. Repair marker 0eef27bb keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.

Common mistake

Misunderstanding Isotopes

Students often think that isotopes have different atomic numbers, leading to confusion about atomic weight order.

Remember that isotopes have the same atomic number (protons) but different mass numbers (neutrons). This helps explain why atomic weight order can vary.

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