Question detail

What role do isotopes play in the periodic table?

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

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

The periodic table

Question

A. They help explain variations in atomic weights among elements.
B. They determine the position of elements in the table.
C. They are used to classify elements as metals or non-metals.
D. They have no impact on the periodic table.

Answer

The correct option is They help explain variations in atomic weights among elements..

Explanation

The correct option is They help explain variations in atomic weights among elements.. They help explain variations in atomic weights among elements. 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 cb69d9da 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.

Related flashcards

Flashcard 1 of 5

Press Space to flip, arrows to move