Answer:
Explanation:
Many elements have one or more isotopes that are radioactive these are called radioisotopes their their nuclei are unstable so they break now or decay and emit radiation
Answer:maybe C
Particles in a solid object are super tight and close to eachother. They do not move past eachother because it is a solid, not a liquid or gas.
Oxygen
Silicon
Aluminium
Iron
Calcium
Oxygen=47 percent
Silicon=28 percent
Aluminium=8 percent
Iron=5 percent
Calcium=3.5 percent
Hope it helps :)
Mark me as brainliest
I think the answer is A.
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