Which chemical element ranks third in percentage composition by mass in the human body?
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Answer: C. Hydrogen 10%
Explanation
Hydrogen accounts for approximately ten percent of the total mass composition of a standard human body. It is present in immense quantities because water molecules and organic macromolecules are rich in hydrogen atoms. Oxygen and carbon rank first and second by mass, making hydrogen the reliable third most abundant element. The human body is primarily composed of water, which consists of two hydrogen atoms bonded to one oxygen. Biochemical molecules including proteins, carbohydrates, and lipids incorporate vast numbers of covalently bound hydrogen atoms. Elemental composition analysis helps scientists understand the fundamental metabolic building blocks of living mammalian organisms.
Oxygen ranks first in percentage composition by mass in the human body, contributing roughly sixty-five percent overall. Calcium is an essential mineral stored primarily in bones but contributes a much smaller percentage of total body mass. Carbon ranks second in mass composition within the human body, contributing approximately eighteen percent to overall weight.
- Subject
- Everyday Science
- Category
- Everyday Science
- Topic
- —
- Difficulty
- medium
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