The littoral zone of a lake is the area closest to the shore. It has very little biological activity but includes a lot of oxygen. The water in the lake's littoral zone is freshwater, free of living organisms such as plants and fish.
All the particles gain more energy and move quicker and therefore they spread out causing air to expand
It would be 187 75 Re since 76 - 1 is 75 and number 2 would be beta particle and a positron.