Which statement correctly identifies structures 1 and 2 in the diagram? Structure 1 is an unstable atom that turns into structure 2, a new atom.
Structure 1 is a stable element that breaks down into structure 2, an unstable element.
Structure 1 is a radioactive element that loses particles to create structure 2, released energy.
Structure 1 is a radioactive atom that decays into structure 2, half of the original unstable element.

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