How many atoms are in the human body?

Question

how many atoms are in the human body?

Answer 1

According to Jefferson Lab (education.jlab.org), an average 70 Kg person, that's about 150 lbs, will have approximately 7*10 to the 27th atoms in their body. That's 7 followed by 27 zeros (7,000,000,000,000,000,000,000,000,000).

That number is bigger than the number of stars in the Universe, which is estimated at 10*21 or 10 followed by 21 zeros.

(10,000,000,000,000,000,000,000).  

Answer 2

zillion,billion,trillion,million's! there are to many to count!

Answer 3

none..I'm an Eve (hahahahahahahahaha...)

Answer 4

many

Answer 5

the count varies from minute to minute

Answer 6

According to Jefferson Lab (education.jlab.org), an average 70 Kg person, that's about 150 lbs, will have approximately 7*10 to the 27th atoms in their body. That's 7 followed by 27 zeros (7,000,000,000,000,000,000,000,000,000).

That number is bigger than the number of stars in the Universe, which is estimated at 10*21 or 10 followed by 21 zeros (10,000,000,000,000,000,000,000).

Very roughly, each human body contains:

4,700,000,000,000,000,000,000,000,000 hydrogen atoms,

1,800,000,000,000,000,000,000,000,000 oxygen atoms,

700,000,000,000,000,000,000,000,000 carbon atoms,

80,000,000,000,000,000,000,000,000 nitrogen atoms,

30,000,000,000,000,000,000,000,000 phosphorus atoms,

10,000,000,000,000,000,000,000,000 calcium atoms,

5,000,000,000,000,000,000,000,000 potassium atoms,

5,000,000,000,000,000,000,000,000 sulfur atoms,

5,000,000,000,000,000,000,000,000 chlorine atoms,

2,000,000,000,000,000,000,000,000 sodium atoms,

1,000,000,000,000,000,000,000,000 magnesium atoms,

70,000,000,000,000,000,000,000 iron atoms,

and much smaller amounts of cobalt, copper, zinc, iodine, selenium, and fluorine.

Answer 7

A lot ! Just kidding.

Would you settle for a whole bunch? I didn't think so. The number of atoms in one person is almost too big to write out. But fortunately there's a shorthand system, called scientific notation, that we use instead for writing really BIG or really SMALL numbers. Since huge numbers are generally just estimates anyway, we just use the first few numbers, followed by a code that tells you how many zeros would follow if you wrote it all out. Ok, here it goes. Hydrogen, oxygen and carbon make up about 99% of the average human. I'm going to cheat a little and leave out the other 1%, which is made up of trace elements (that is, stuff there's only a trace of in the body). Then, let's assume an average adult weighs 70 kilograms. Be sure to keep in mind that the following numbers are based on the number of atoms, not percent of body weight (by weight we are mostly oxygen). A 70 kg body would have approximately 7*1027 atoms. That is, 7 followed by 27 zeros:

7,000,000,000,000,000,000,000,000,000

Of that, 4.7*1027 would be hydrogen atoms, which have one proton and one electron each. Another 1.8*1027 would be oxygen, which has 8 protons, 8 neutrons and 8 electrons. There are 7.0*1026 carbon atoms, which have 6 protons, 6 neutrons and 6 electrons. Now, let's add that all up:

Protons Neutrons Electrons

Hydrogen 4.7*1027 0 4.7*1027

Oxygen 1.4*1028 1.4*1028 1.4*1028

Carbon 4.2*1027 4.2*1027 4.2*1027

Total 2.3*1028 1.8*1028 2.3*1028

Well, you'll have to agree that really is a whole bunch.

Answer 8

none