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Questions and Answers
Moseley's work confirmed Mendeleev's belief that atomic weights were the primary factor determining an element's properties.
Moseley's work confirmed Mendeleev's belief that atomic weights were the primary factor determining an element's properties.
False
Mendeleev's periodic table was completely replaced by Moseley's.
Mendeleev's periodic table was completely replaced by Moseley's.
False
X-rays played a crucial role in Moseley's discovery
X-rays played a crucial role in Moseley's discovery
True
What was the primary basis for arranging elements in Mendeleev's periodic table?
What was the primary basis for arranging elements in Mendeleev's periodic table?
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Who discovered that the properties of elements are more closely related to their atomic number than their atomic mass?
Who discovered that the properties of elements are more closely related to their atomic number than their atomic mass?
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The modern periodic table is primarily arranged based on
The modern periodic table is primarily arranged based on
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What is the significance of energy sub-levels in the modern periodic table?
What is the significance of energy sub-levels in the modern periodic table?
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Which scientist first proposed leaving gaps in the periodic table for undiscovered elements?
Which scientist first proposed leaving gaps in the periodic table for undiscovered elements?
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How do the elements in the modern periodic table differ from those in Mendeleev's table?
How do the elements in the modern periodic table differ from those in Mendeleev's table?
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Which of the following is NOT true about the modern periodic table?
Which of the following is NOT true about the modern periodic table?
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Study Notes
Mendeleev's Periodic Table
- Arranged elements primarily based on atomic weights.
- Mendeleev believed atomic weight was the key factor influencing an element's properties.
- The table included gaps for undiscovered elements, anticipating their existence and properties.
Moseley's Contributions
- Demonstrated that properties of elements relate more closely to atomic number than atomic mass.
- Replaced Mendeleev's periodic table with a more accurate arrangement based on atomic number.
- Utilized X-rays to discover atomic numbers, leading to a redefinition of the periodic law.
Modern Periodic Table
- Organized primarily by atomic number, a shift from the earlier emphasis on atomic mass.
- Displays elements in order of increasing atomic number, improving the relationship between elemental properties.
- Introduces energy sub-levels, which categorize elements within blocks (s, p, d, f) based on electron configurations, explaining the periodic trends.
Significant Scientists
- Mendeleev first proposed the concept of gaps for undiscovered elements in the periodic table.
- Moseley is credited with solidifying the concept of atomic number as a fundamental property for periodic classification.
Differences Between Tables
- Modern periodic table provides a more systematic and accurate representation of elemental relationships compared to Mendeleev’s earlier version.
- Elements are grouped in a way that reflects consistent patterns in the properties and behaviors of grouped elements.
Misconceptions about the Modern Table
- Any assertion claiming the modern periodic table is arranged solely by atomic mass is incorrect; it is fundamentally based on atomic number.
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Description
This quiz explores the contributions of Moseley and Mendeleev to atomic theory. Focus is given to how Moseley confirmed Mendeleev's belief regarding atomic weights as a determining factor for the properties of elements. Test your knowledge of their groundbreaking work in chemistry.
