Write short notes.
Structure of the modern periodic table.
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.
