I bought some lentils, groats, sunflower seeds, etc from whole foods (organic raw). Are they safe to sprout?
Sure! sprouting is fun :-) You can sprout almost any kind of grain or cereal, including but not limited to the kinds you mentioned.
Just soak them in water overnight, put them into a colander for the excess water to drain, then put the colander in some dark, dry place (I use a cupboard) for them to start sprouting. It might take a day or two (or more), depending on the breed of course.
The process of sprouting will turn the seed into a vegetable, and will increase the amount of nutrients in it — that's more vitamins, minerals and anti-oxidants for you!
Anyway, it's a safe process, regardless of the seeds being organic or not. Just to be on the safe side you may want to use latex gloves, protective eye goggles and perhaps a bullet proof vest :-)