Here are the chemical symbols for the naturally occurring elements found in the human body, along with their approximate percentages by weight:

* Oxygen (O) - 65%

* Carbon (C) - 18.5%

* Hydrogen (H) - 9.5%

* Nitrogen (N) - 3.2%

* Calcium (Ca) - 1.5%

* Phosphorus (P) - 1%

* Potassium (K) - 0.35%

* Sulfur (S) - 0.25%

* Sodium (Na) - 0.15%

* Chlorine (Cl) - 0.15%

* Magnesium (Mg) - 0.05%

* Iron (Fe) - 0.006%

* Other Elements (Trace Amounts) - Less than 0.01% (including elements like zinc, copper, iodine, etc.)

It's worth noting that these percentages can vary slightly depending on individual factors like age, diet, and health status.