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.