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Write short notes. Structure of the modern periodic table.

Question 14.

Write short notes.

Structure of the modern periodic table.

Answer:

Structure of the modern periodic table:


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


⇒ Similarly, it contains vertical groups 1 to 18.


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


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


⇒ There are 118 boxes in the periodic table.


⇒ The whole periodic table is divided into four blocks.


⇒ 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.


⇒ The first period contains 2 elements.


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


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


⇒ The d-block contains transition metals.