If n is equals to 6 the correct sequence for filling of electron will beans is a that is n.s→(n-2)f→(n-1)d→np if have also attached the solution that I need for this question I am not able to get from the page that I have uploaded on the image that I have uploaded in that image if 1 is equal to 6 then from where 6s 6p 5D 4f comes from as we know that that as PDF is the increasing level of energy from where 6s 6p 5d 4f comes from what also in the correct option what does the thing inside the brackets indicates .Plz help me











