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FAQs on Quick Revision: Classification of Elements & Periodicity in Properties - Chemistry Class 11 - NEET

1. What is the periodic table and how is it organized?
Ans. The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. It is divided into periods (rows) and groups (columns), with elements in the same group having similar properties.
2. What are the main groups in the periodic table and what are their properties?
Ans. The main groups in the periodic table are Group 1 (Alkali metals), Group 2 (Alkaline earth metals), Group 13 (Boron group), Group 14 (Carbon group), Group 15 (Nitrogen group), Group 16 (Chalcogens), Group 17 (Halogens), and Group 18 (Noble gases). Each group has distinct properties, such as alkali metals being highly reactive and noble gases being inert.
3. How are elements classified in the periodic table?
Ans. Elements in the periodic table are classified based on their electronic configuration and chemical properties. They are organized into groups, where elements within the same group have similar properties due to their similar outer electron configurations.
4. What is periodicity in properties of elements?
Ans. Periodicity in properties of elements refers to the recurring pattern of their properties in the periodic table. Elements in the same period show a gradual change in properties as the atomic number increases. For example, atomic radius generally decreases across a period, while ionization energy increases.
5. What are the trends in atomic size and ionization energy across a period?
Ans. Across a period in the periodic table, atomic size generally decreases from left to right due to an increase in effective nuclear charge. Ionization energy, on the other hand, generally increases from left to right as it becomes more difficult to remove an electron from a smaller atom with a stronger attraction between the nucleus and electrons.
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