Co-relation of science with maths

Unit: Structure of atom

STD: IX

By comparing with different geometrical shapes we can tell the students that
  atom , nucleus are round in shape.
And the shells or orbits are circular in shape.

The maximum number of electrons that can be present in each shell is 2n^{2, where n is shell/orbit number. So to find out the exact number of electrons in each shell, we can make students to solve the formula} 2n² by putting the value of 'n'.