Demarcation of periodic table in S, P, d and f blocks

Periodic table has been divided into four block s block, P block, d block and f block

Nobel Gases - "Last group of the periodic table is known as Nobel gases."

These gases are very un-reactive because of their electronic configuration. These gases have complete outermost shell which means there is no further space for any electron - so if any element does not lose or gain electron that element is known as inert or unreactive - so Nobel gases are.

• Representative Elements

S and p Block elements are known as representative elements.

• S - Block elements - We call IA and IIA groups - s block elements because the last electrons goes to s-subshell in these two groups. For IA $ns^1$ and for IIA $ns^2$electronic configuration means in IA group there is one electron in outermost shell and for IIA group there two electrons in outermost shell which can be lost/donated.

• P block Elements - IIIA to VII groups in periodic table known as P- block elements. In these groups last electron goes to p-subshell. Electronic configuration for these group from $np^1$ to $np^6$

• d - block Elements - d block elements are also known as outer- transition elements. In these elements last electron always goes to d- subshell. It consist of three series.

• f - block Elements -They are known as inner -transition elements as well. Last electron goes to f-subshell and it consist of two series

  1- Actinides  
  
  2- Lanthanides