https://preparationpoint.info/solved-past-papers-mcqs/ppsc-past-papers/ppsc-past-papers-2018/excise-taxation-inspector-dg-khan-region-control/according-to-recent-researchin-university-of-berlin-which-element-can-make-the-bond-with-more-than-four-atoms-that-have-previously-seen-its-limit/