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Questions and Answers
Mendeleev's periodic table was the first attempt to organize elements based on their atomic numbers.
Mendeleev's periodic table was the first attempt to organize elements based on their atomic numbers.
False (B)
Moseley's periodic table corrected some of the inconsistencies found in Mendeleev's table.
Moseley's periodic table corrected some of the inconsistencies found in Mendeleev's table.
True (A)
The modern periodic table is essentially the same as Mendeleev's periodic table
The modern periodic table is essentially the same as Mendeleev's periodic table
False (B)
Both Mendeleev and Moseley arranged elements in order of increasing atomic mass.
Both Mendeleev and Moseley arranged elements in order of increasing atomic mass.
The periodic table is a tool used primarily by chemists.
The periodic table is a tool used primarily by chemists.
Mendeleev arranged elements in order of increasing atomic number.
Mendeleev arranged elements in order of increasing atomic number.
Mendeleev's periodic table accurately predicted the existence of undiscovered elements.
Mendeleev's periodic table accurately predicted the existence of undiscovered elements.
The groups in Mendeleev's periodic table represent elements with similar chemical properties.
The groups in Mendeleev's periodic table represent elements with similar chemical properties.
Mendeleev's periodic table was completely accurate in arranging elements based on atomic weights.
Mendeleev's periodic table was completely accurate in arranging elements based on atomic weights.
Isotopes were a major challenge for Mendeleev's periodic table.
Isotopes were a major challenge for Mendeleev's periodic table.
Study Notes
Mendeleev's Periodic Table
- First attempt to systematically organize elements based on atomic numbers.
- Arranged by increasing atomic mass, leading to some discrepancies.
- Successfully predicted the existence of undiscovered elements, showcasing its predictive power.
- Groups represented elements with similar chemical properties, highlighting trends in chemical behavior.
- Faced challenges with isotopes, complicating the arrangement of elements by atomic weight.
Moseley's Contributions
- Corrected inconsistencies found in Mendeleev's arrangement by using atomic number instead of atomic mass.
- Helped refine the modern periodic table, improving overall accuracy and reliability.
Modern Periodic Table
- Essentially retains the foundational structure laid out by Mendeleev but incorporates Moseley’s improvements.
- Serves primarily as a vital tool for chemists to understand element relationships and chemical behavior.
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