Any unstable substance at the atomic level is said to be

When an atomic nucleus breaks up or changings, emitting radiation

The decay that occurs when the atom emits 2 protons and 2 neutrons

The decay that occurs when a neutron changes into a proton while emitting an electron

The decay that occurs when electromagnetic waves of high frequency and energy are emitted

The process of splitting an atom

The process of combining atoms

The domino effect that occurs if a critical mass has been reached allowing fission to split other atoms

This device initiates an uncontrolled chain reaction of nuclear fission.

The device uses nuclear fusion and is 2,500 more power than the atomic bomb

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