Tree Maps are good at visualizing the hierarchical data, where each element has a parent (except for the root element). The children of one of the parents form the whole parent all together. Labels are switched on by default, showing the name and the mass of the element.
This Tree Map Chart demonstrates the mass part of chemical elements that are present in an average human body of 70 kg. The root element has 6 children, where one of them is a parent of the lower level children: "Other" elements involve a list of elements with mass under 1 kg. One of the "Other" elements is a parent too, holding elements which parts in the body are even smaller than the elements of the level above. Tooltips show the name of the element, its mass part, essentiality for a human and the positive and negative effect this element has on a body.