Class 11 Chemistry — Chapter 3: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

What you'll learn

• ▸Early Attempts at Classification: Triads and Octaves
• ▸Mendeleev's Periodic Law
• ▸Structure of Mendeleev's Periodic Table
• ▸Prediction of Undiscovered Elements
• ▸Anomalies in Mendeleev's Arrangement
• ▸Lothar Meyer's Contribution

Chapter Summary

--- PAGE 1 --- UNIT 3 11082CH03 CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES Objectives After studying this Unit, you will be able to - appreciate how the concept of grouping elements in accordance to their properties led to the development of Periodic Table. - understand the Periodic Law; - understand the significance of atomic number and electronic configuration as the basis for periodic classification; - name the elements with Z >100 according to IUPAC nomenclature; - classify elements into s, p, d, f blocks and learn their main characteristics; - recognise the periodic trends in physical and chemical properties of elements; - compare the reactivity of elements and correlate it with their occurrence in nature; - explain the relationship between ionization enthalpy and metallic character; - use scientific vocabulary appropriately to communicate ideas related to certain important properties of atoms e.g., atomic/ionic radii, ioni…

Practice Questions from this Chapter

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1. Explain how elements are classified. Get Solution →
2. Describe the first Periodic Table. Get Solution →
3. Compare atomic weight and number. Get Solution →
4. According to the text, how many elements were known by the year 1800? Get Solution →
5. Who was the first scientist mentioned to consider the idea of trends among properties of elements, proposing the Law of Triads? Get Solution →
6. John Alexander Newlands' Law of Octaves stated that every ______ element had properties similar to the first. Get Solution →
7. What property did Dmitri Mendeleev originally use to arrange the elements in his Periodic Table? Get Solution →
8. What did Mendeleev name the undiscovered element that he predicted would be found under silicon? Get Solution →

Did you know?

• 💡 Most elements heavier than iron are forged inside exploding stars called supernovae.
• 💡 The element Einsteinium was named in honor of the famous physicist Albert Einstein.
• 💡 Mendeleev famously predicted the existence of several elements before their actual discovery.
• 💡 A single gram of pure gold can be stretched into a wire over a mile long.
• 💡 Your body contains enough carbon to make about 9,000 pencils.

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