In chemistry, scientists classify the available elements on the basis of their properties. In the Ap Class 10 Physical Science Chapter 9 Classification of elements, the way in which various elements are classified are clearly explained.
- Mendeleeff’s Periodic law – The physical and chemical Properties of the elements are periodic functions of their Atomic Masses.
- Moseley’s Periodic law – The physical and chemical properties of the elements are periodic functions of their Atomic numbers.
- Modern Periodic Law – The physical and chemical properties of the elements are periodic functions of their electronic configurations.
- The elements in the modern periodic table follow the arrangement of 18 groups and 7 periods.
- Based on which subshell the differentiating electron enters in the atom of the given element, elements are classified into s, p, d, f blocks.
- Except for Zn group, all the d- block elements are known as transition elements, while all the f-block elements (both Lanthanides, Actinides) are known as inner transition elements.
To better understand the concepts discussed in the chapter, let us look at a few chapter questions.
Class 10 Physical Science Chapter 9 Questions
- What are the limitations of Mendeleeff’s periodic table? How could the modern periodic table overcome the limitations of Mendeleeff’s table?
- Define the modern periodic Law. Discuss the construction of the long form of the periodic table.
- Elements in a group generally possess similar properties, but elements along a period have different properties. How do you explain this statement?
- What is a periodic property? How do the following properties change in a group and period? Explain.
- Name two elements that you would expect to have chemical properties similar to Mg. What is the basis for your choice?
Stay tuned to BYJU’S to get the latest notification on SSC exam along with AP SSC model papers, exam pattern, marking scheme and more.