What is the most abundant element of the human body?

Answer: The human body comprises four essential elements: hydrogen, oxygen, carbon, and nitrogen, which comprise 96% of all atoms.

The human body also contains other elements, including sulphur, phosphorus, and calcium (for bones). The most abundant element in a human’s body is oxygen, which contains 65 per cent of its weight. With 18.5 per cent of the total weight, carbon makes up the second-highest abundance of elements in the human body.

9.5% of the human body’s weight is made up of hydrogen.