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4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case. If the number of protons and electrons are equal, that atom is electrically neutral. The idea that matter is made up of discrete units is a very old idea, appearing in many ancient cultures such as Greece and India. However, these ideas were founded in philosophical and theological reasoning rather than evidence and experimentation.
As a result, their views on what atoms look like and how they behave were incorrect. They also could not convince everybody, so atomism was but one of a number of competing theories on the nature of matter. It was not until the 19th century that the idea was embraced and refined by scientists, when the blossoming science of chemistry produced discoveries that only the concept of atoms could explain. This means that 100g of tin will combine either with 13.