my html looks like this
Restructure your HTML slightly - wrap each radio group in (say) a div. Then you can just do something like this to validate the form when the user submits it:
if ($('div:not(:has(:radio:checked))').length) {
alert("At least one group is blank");
}
Of course this can be tweaked in various ways to suit your HTML. The idea was from Find all radio groups which haven't been selected