In orbits of the atoms, two electrons are revolving in opposite spin.As the charge of two electrons is negative there should be repulsive force between the two electrons.Then how will the electrons revolve?

Hey , We know that electron feel repulsion with another electron but there is a addition in concept that if my both the two electron is of same spin then only we have a repulsive effect on each other

while electrons of opposite spin have more of an attractive effect on each other. That''s Why electrons with the same spin will not both be able to enter into or occupy the same orbital. And one more thing i want to suggest you to read on quantum theory from NCERT Book Class XI