How big atomic bomb could be? 3, 5, 10 meters long? One , two meters diametar? And wieght? Ton, two,three...?
From.my point of view, Iran, even it could produce something that belong to that class- has no capabilities, neither knowledge- to transport it from production line to target- especially if that target is 1000+km away....
For that they need air supeority over very big portion of airspace- not to mention pilots or artilery capable of hit target.
No case, but Iran will pay huge price to be non coperative and oposition to the rest of the World.