Radioactive isotopes of elements can be used in medicine to diagnose and treat disease. Which statement describes how a stable isotope is different from a radioactive isotope of that element? A OA radioactive isotope has a stable mucleus containing extra protons.
BOA radioactive isotope has a stable nucleus that absorbs smaller particles
COA radioactive isotope has an unstable meleus that emits smaller particles
DO A radioactive isotope has an unstable nucleus that becomes larger over time

we need the questions , i may then you.

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.

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it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.