What do radioactive substances give off that makes them dangerous?

Danger of Radioactive Substances

Those elements are dangerous because they are made up of atoms with unstable centers, or nuclei. Seeking greater stability, they constantly emit energy as radiation, in the form of waves like gamma rays or X-rays, and as particles smaller than atoms.

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Mamuhay ng mapayapa

Sa mesopotamia ay sumer,akkad,babylon,assyria,at chaldean
sa indus ay mohenjo-daro at harrapa
sa tsina ay shang,qin,chou,ming