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the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur

the point in time at which something must be completed