JEE 2024: Periodic Properties Class 11 One Shot | 1 Month 11th Done | JEE Chemistry #jeepreparation
Vedantu JEE English・96 minutes read
Understanding the history and key topics of the classification of elements and periodic properties in chemistry is crucial for exam preparation, covering Mendeleev's contributions, periodic trends, and the modern periodic table based on atomic number and electronic configuration. Various factors like atomic size, ionization energy, electron gain enthalpy, electronegativity, and bonding are explored to understand the properties and behavior of different elements across the periodic table.
Insights
- Understanding the historical evolution of the periodic table, from Mendeleev's organization based on atomic weights to Mosley's modern table based on atomic number, is crucial for comprehending the classification of elements and their properties.
- The periodic table's structure, including the arrangement of elements in periods and groups, plays a vital role in predicting properties and trends such as atomic size, ionization energy, electron affinity, and electronegativity, essential for exam preparation.
- The concept of shielding effect, which involves inner electrons reducing the effective nuclear charge felt by outer electrons, influences atomic size, ionization energy, and electron affinity trends across the periodic table, impacting the chemical behavior of elements significantly.
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Recent questions
What is the significance of Mendeleev's periodic table?
Mendeleev's periodic table organized elements by atomic weights, predicting properties of undiscovered elements. He arranged elements with similar properties in columns and rows, leaving gaps for future discoveries. Mendeleev's adjustments improved accuracy, influencing the modern periodic table based on atomic number.
How does the modern periodic table differ from Mendeleev's?
The modern table is based on atomic number, explaining periodicity through electron configuration. It consists of 18 groups and 7 periods, classifying elements by outermost shells. Mendeleev's table focused on atomic weights and properties, while the modern table emphasizes atomic number and electronic structure.
What are the key trends in the periodic table?
Periodic trends include ionization enthalpy, electron gain enthalpy, and electronegativity. Physical properties like melting points and densities vary across periods and groups. Understanding these trends aids in predicting element behaviors and properties.
How are elements classified in the periodic table?
Elements are grouped into S, P, D, and F blocks based on electron configurations. Lanthanides and actinides are inner transition elements within the D block. The table's structure helps in identifying elements and understanding their properties.
Why is the concept of shielding effect important in chemistry?
Shielding effect explains how inner electrons shield outer electrons from the nucleus, affecting atomic size and properties. It influences effective nuclear charge, ionization energy, and electron affinity. Understanding shielding effect aids in comprehending atomic behaviors and trends in the periodic table.
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