Q4 of 31 Page 198

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.

Classification of elements


i. The s-block contains alkali metals (period 1) and alkaline earth metals (period 2).


ii. The p-block (period 13- 18) contains metals, non- metals and metalloids.


iii. The d-block (period 3-12) contains transition metals.


iv. The f-block placed separately at the bottom of the table contains lanthanides and actinides.


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Define the modem periodic law. Discuss the construction of the long form of the periodic table.

 5

Given below is the electronic configuration of elements A, B, C, D.

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Write down the characteristics of the elements having atomic number 17.

Electronic configuration ………………………….


Period number ………………………….


Group number ………………………….


Element family ………………………….


No. of valence electrons ………………………….


Valency ………………………….


Metal or non-Metal ………………………….