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.
Periodic Laws
- 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.
Periodic Table
- 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?
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