O level chemistry

arrangement of electrons in orbitals around an atomic nucleus. The electronic configuration of an atom in the quantum-mechanical model is stated by listing the occupied orbitals, in order of filling, with the number of electrons in each orbital indicated by superscript.

It is distribution of electrons in shells and subshells

Shells are K, L , M and N having their own capacity for electrons

It is given K=8 , L=18 , M=32

Subshells are s, p, d, and f having their own capacity of electrons.

Capacity for electron is s=2, p=6, d=10, f=14

Tree method is used to perform electronic configuration in sub shells.

It is according to energy level

first of all electron will go s subshells and the p and f.

We can also use following trick to fill electrons in subshells

school school public school division public school

p subshell=school, p= public, d=division

Conclusion : electronic configuration of an atom in the quantum-mechanical model is stated by listing the occupied orbitals, in order of filling, with the number of electrons in each orbital indicated by superscript.

We can also use following trick to fill electrons in subshells.

Uses: It has following uses

1. Understanding of periodicit

2. Chemical reactivity

3. States of matter

4. possible products