Question

As of 2010, there are 118 known elements. of those, how many are believed to be essential to human biology?

Answer 1

From the 118 known elements, 25 elements are believed to be essential to human biology.

Out of 25 elements , 6 elements namely  – carbon, oxygen, hydrogen, nitrogen, calcium and phosphorus , they make up about 99% of the human body. Some other elements like - potassium, sulfur, sodium, chlorine, and magnesium, they are also found in the human biology.