I think mass fraction, because if it was moles hydrogen would top the list. The main reason Oxygen has such a high percentage is because of its larger atomic weight.
I was wondering: if as much of the human body is H2O as is often said, then how could the H not be a higher percentage? I guess you've offered the explanation.
It is by mass. By mole fraction, hydrogen is the most common by far with about 60%, followed by oxygen with 24% and carbon with 12%. Nitrogen is far off with 1% and the rest is just fractions of a percent.
This must be a massic proportion, there are way more hydrogen atoms than oxygen atoms, but oxygen is sixteen times heavier than hydrogen. Given that the human body consists of two thirds of water, and that most of water's mass is due to oxygen, this seems logical.
Charlielizard: unless they have dual citizenship or are Mexican-Americans, then, yes, of course, they are non-American. American meaning, obviously, as is near universally understood, people with citizenship in the United States of America. As opposed to Mexicans, which are people with citizenship in the United States of Mexico (or Los Estados Unidos Mexicanos), the country immediately to the south. That's how the English-language demonyms have been used around the entire world for the past several hundred years. Hope this clears things up for you.
How could America (a singular noun) be 2 continents? That doesn't even make sense. It's not a region or a hemisphere. North America is 1 continent. South America is 1 continent. Together they might be called "The Americas." America is 1 country. Not hard to understand this unless you're being deliberately obtuse or antagonistic. But of course some people enjoy that. Cue said people to comment below...
I go with: 1. Organic compounds...C. 2. Water...H&O. 3. Proteins...N. 4. Nucleic acids...P. 5. Bones...Ca. 6. Nerve...Na&K. 7. Salts...Cl. 8. I can't think of anymore. Try from atomic number 1, skipping those that are not gonna be here...Mg,S&Fe
I feel bad to face the need of using the last method; I should be able to tell those elements as a biology student...:(
Add that to the fillings in our teeth and the preservatives in our vaccines. Not to mention how we used to "play" with mercury in high school chemistry class because it was so cool to watch it rolling around in the palms of our hands. I wonder how I've survived so many decades. :)
salt is sodium chloride, most people eat it all the time. Chlorine is only a problem when there is a lot of pure chlorine around, and pretty much anything is poisonous at high enough doses
I'd honestly think Hydrogen would be more abundant than Oxygen, because 75% of the Human Body is made of Water, and Water is made of 66.6% of Hydrogen. Correct me if I'm wrong (which I probably am), but I'd think that would compromise at least 50%. Also, you probably won't count this, but Hydrogen is the "building block" to every element, so I'd think the abundance of hydrogen would be greater than 10%. I think it deserves at least 30%.
This quiz is going by total atomic mass, not number of atoms. Water has twice as many hydrogen as oxygen atoms, but oxygen atoms are 16 times heavier than hydrogen atoms, so water is counted as 8/9 oxygen.
And hydrogen can be made into other elements by nuclear fusion, but when that happens it ceases to be hydrogen. This is a chemistry quiz so that wouldn't count anyway.
Uranium and plutonium are not the most common elements in the human body. This quiz lists the 12 most common elements of the periodic table in your body. Uranium is the 5th least common element in the body, approximately 0.0000001% or 1 out of 10 million molecules of your body is uranium. Meanwhile, literally none of your body is plutonium, making your comment absolutely ridiculous.
ikr, despite the fact that they ingest chlorine almost every time they ingest sodium... it's basically goofy people like my mother, who dropped out of 9th grade
For H2O, hydrogen is only 2/18 of the mass as oxygen is much heavier (16 g/mol vs 1 for hydrogen). As opposed to 2/3 if it was molar, where it should be 47% from water alone.
All the elements added up make up 99.356% of your body, only the top 6 make up 98.5%, the top 3 make up 93%, and the top two make up 83%, It’s surprising to learn that since it looks like our bodies are made up of many things, when it’s mostly just a couple
Clue's in the name.
I feel bad to face the need of using the last method; I should be able to tell those elements as a biology student...:(
Nice quiz!
3×10−9
Jk
For H2O, hydrogen is only 2/18 of the mass as oxygen is much heavier (16 g/mol vs 1 for hydrogen). As opposed to 2/3 if it was molar, where it should be 47% from water alone.
IRON.
*inputs Radon*