Question

How do you find the electronic configuration using the periodic table?

Answer 1

Hint: As we all know Periodic table is the arrangement of all the chemical elements in order of their increasing atomic number which is equal to the total number of protons in the atomic nucleus. And by electronic configuration we mean the distribution of electrons among the available orbitals. It lists the electrons occupying the orbital in a superscript format.

Complete step-by-step answer:
In order to find the electronic configuration from the periodic table, we must know the atomic number of the element which is mentioned in the periodic table itself.
As we know the atomic number gives the number of protons which is the same as the number of electrons of that element.
The following is the order we must follow in order to write the electronic configuration of the element.
$\
  1s \\
  2s{\text{ 2p }} \\
  {\text{3s 3p 3d}} \\
  {\text{4s 4p 4d 4f}} \\
  {\text{5s 5p 5d 5f}} \\
  {\text{6s 6p 6d}} \\
  {\text{7s}} \\
\ $
We should remember that s block gets two electrons, p block gets six electrons, d block gets ten electrons and f block gets fourteen electrons. Now according to this order, we will be able to write the electronic configuration of the elements.

Note: Elements are arranged by period and group, with the period corresponding to the principal energy level, and the group is related to an extent where the subshells are filled. The properties of an atom are directly related to the number of electrons in various orbitals. The electrons in the outermost or valence shell are very important because they are involved in the sharing and exchange of electrons that is responsible for chemical reactions.