The whole idea of preventing Iran from becoming nuclear is to preserve Israel's security and to stop the spread of nuclear arms proliferation.As to the question of if Israel could do this...certainly yes. They have done this before in 1981 and the personnel who flew and supported those missions are pretty high up in the food chain these days.
If they intend to strike with unconventional weapons then it's possible to use a small number of fighters. Nuclear weapons don't require large strike packages to cause wide scale damage and a small force has a better chance of getting in undetected.
DA
Nuking Iran to prevent Iran from going nuclear is a very dangerous idea and no sane person will think of it ever happening. Such actions will endanger Israel's security to an extent that even Uncle Sam may not be able to save Israel. It will surely turn every country in the region go nuclear by which way they can. Will Israel and US want that..
Guys, please show maturity when discussing such grave matters.