Hi Humalien,
To get personal element, it can be calculated from the Ba Zi of the individual. By getting the overall Heavenly Stem/ Earthly Branch from the year, month, day and time born, only the life element can be known. The Element from this calculation, you can understand what is suitable or unsuitable for you, in career, colors and so on. But in general, from the common understanding you can also get the calculated Qua element from the year you born. Refer to the article on 'How to Calculate your Qua Number' in this website or from my e-book.' Year 2010 Tiger Geng Yin Complete Manual'.
Besides, in every sign of the Chinese twelves zodiac they do belong to either Yin or Yang and also with the five elements on them.
If you are :- Rat-water, Tiger-wood, Dragon-earth, Horse-fire, Monkey-metal or Dog-earth you are Yang,
and if you are Cow-earth, Rabbit-wood, Snake-fire, Sheep-earth, Rooster-metal and Pig-water then you are Yin.
Happy reading!!

As everything works in an balanced manner, that means in an body we need an equal energy on both the Yin /Yang Qi for a harmony and peaceful life just like the black/white symbol of Tai Chi; I-Ching, things will get its fullest benefits if they are balanced. whenever any one side of the energy is lower, the stronger dominated energy is taking charge on the whole body. If that weaker energy is the positive Qi, that cause the negative Qi to get stronger. This is when you will encounter lots of negative effects drawing to your physical body. This explained to why people sometimes gets backstabbers, dislike you or as what you said also against you!.

which part? can you please explain in a more precise manner?