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•• Reactions in which kinetic energy is lost (ΔK < 0) are called endothermic and cannot occur below a minimum (threshold) initial energy. (Reactions in which kinetic energy is released are called exothermic.) Which of the following reactions are endothermic, and what are their threshold kinetic energies?
(a) n + 208Pb → p + 208Tl
(b) n + 207Pb → α + 204Hg
(c) n + 187Os → p + 187Re
(d) n + 197Au → 2H + 196Pt
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