The Plum Pudding Model
In this model the atom is formed by electrons of negative charge set in a positive atom, as if they were plums in a pudding.
In this model the number of negative charges was the appropriate for neutralize the positive charge. If the atom loses an electron, the structure will be positive, in the other hand if it wins an electron, it will be negative. In this way he explained the formation of iones, but he didn't explain the other kinds of radiations.