Wasnt it Israel who attacked an Iraqi Nuke Plant/Factory back in 1983? or was it 1985? before it came online.
It was Israel...and Iran.
Iran co-operated on those strikes with Israel, and bombed some other Iraqi facilities as well.
The Iranians seem to have learnt something from that. Thieir most important facility, the enrichment plant, is located partly underground.
Probably the most important parts, the bits they want to hide, are wholly underground.
That makes bombing difficult, as does the range. The Iraqi facilities were much closer to Israel, the Iranian facilities are about 1,0000 km as the crow flies.
Any Israeli attack on Iran also has to overfly Iraq, which means the US has to agree to it, which is unlikely with US troops on the ground in Iraq.
Israel has many nukes and may soon have subs able to launch nukes. Israel will not take a chance on letting Iran obtain nuclear weapons. The situation is not good.
Israel will not use nuclear weapons in a pre-emptive strike on a wide scale, and I doubt they'd use them in a strike against a single target.
If Israel uses nukes first, it becomes a pariah and endagers it's own future far more than Iranian nukes would.