Question 1
Question detail
Why was Mendeleev's periodic table significant in relation to isotopes and atomic weight?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
The periodic table
Question
Why was Mendeleev's periodic table significant in relation to isotopes and atomic weight?
Answer
Mendeleev's periodic table was significant because it highlighted the limitations of ordering elements solely by atomic weight, as isotopes could lead to variations in atomic weight. This understanding allowed for a more accurate arrangement of elements based on their properties rather than just their weights.
Explanation
This answer is strong as it links Mendeleev's work to the concept of isotopes, illustrating how scientific understanding evolved. The question tests the student's ability to analyze the impact of isotopes on the development of the periodic table.
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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