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lozanna [386]
3 years ago
13

Which three elements make up most of the human body?

Biology
2 answers:
damaskus [11]3 years ago
5 0
Oxygen, carbon, and hydrogen.
alexira [117]3 years ago
4 0

Answer:

The three elements make up most of the human body are

1. Oxygen

2. Carbon

3. Hydrogen

Explanation

The human body is made up of many different elements, but oxygen, carbon, and hydrogen these elements are present in abundance.

  • <u>Oxygen</u>: oxygen is the first major element that is present in the abundant, about 65 percent total weight of a human body is made up of oxygen. Oxygen is consumed by both inhalation and exhalation process.
  • <u>Carbon:</u> It is the second most important element of the human body, about 18 percent total weight of a human body is made up of carbon.carbon is consumed by the food material.
  • <u>hydrogen:</u> It is the third major element of the human body, about 9 percent of the total weight of the human body is made of hydrogen. In a water molecule, two hydrogen are there.
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The correct option is B

Explanation:

Isotopes of the same element have the same atomic number (number of protons) but different mass number. Hence, <u>all the three naturally occurring carbon isotopes mentioned in the question have 6 protons each. Since the number of protons in a neutral atom is equal to the number of electrons in the same atom, each of these isotopes also have 6 electrons</u>.

However, to determine the number of neutrons in each atom, the number of protons (atomic number) is subtracted from the mass number.

Hence, the number of neutrons in carbon-12 is 12 - 6 = 6

the number of neutrons in carbon-13 is 13 - 6 = 7

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