The 5 elements in Feng-Shui are:
Each element is further divided into Yin component and Yang component with the Yang component representing the more dynamic and stronger component while yin component refers to the more static and weaker component.
For example, Yang-Water refers to moving water while Yin-Fire refers to weak Fire.
It is believed that there has to be a balanced of all 5 elements in life for things to work out to the maximum.