Q. 34.5( 16 Votes )

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

Answer :

Modern periodic law states that “the physical and chemical properties of elements are the periodic function of their electronic configurations of their atoms”.


i. The modern periodic table contains horizontal periods 1 to 7.


ii. Similarly, it contains vertical groups 1 to 18.


iii. Atomic numbers are indicated on the upper part of the element.


iv. Two rows are separately placed at the bottom of the periodic table. These are called lanthanide series and actinoid series.


v. There are 118 boxes in the periodic table.


vi. The whole periodic table is divided into four blocks.


vii. The left side is s-block, right side is p-block, in the middle there is d-block and the lanthanide series and actinoid series form the f-block.


viii. The first period contains 2 elements.


ix. The s-block contains alkali and alkaline earth metals.


x. The p-block contains metals, non-metals and metalloids.


xi. The d-block contains transition metals.


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