All the d- block elements (except Zn group) are known as transition elements and all the ff-block elements (both Lanthanides, Actinides) are known as inner transition elements.
Periodic properties of elements and their trends in groups and in periods
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Reflections on Concepts
1. Newlands proposed the law of octaves. Mendeleeff suggested eight groups for elements in his
table. How do you explain these observations in terms of modern periodic classification?(AS1)
2. What are the limitations of Mendeleeff’s periodic table? How could the modern periodic table
overcome the limitations of Mendeleeff’s table? (AS1)
3. Define the modern periodic Law. Discuss the construction of the long form of the periodic
table. (AS1)
4. Explain how the elements are classified into s, p, d and f- block elements in the periodic table
and give the advantage of this kind of classification. (AS1)
5. Write down the characteristics of the element having atomic number 17. (AS1)
Electronic configuration ________________________
Period number
________________________
Group number
____________________________
Element family
________________________
No. of valence electrons ____________________
Valency
_________________________
Metal or non-metal
________________________
