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We don't inhale a single element and exhale another. We inhale air, a mixture of gas compounds and exhale another mixture after our bodies use and rearrange some of it. By mole fraction (i.e., by quantity of molecules), dry air contains 78.08% nitrogen (N2), 20.95% oxygen (O2), 0.93% argon (Ar), 0.03% carbon dioxide (CO2), and small amounts of other trace gases.
We do not inhale pure oxygen atoms, O, and turn them into carbon dioxide molecules, CO2.
The base element, O, is highly reactive and isn't even in the mix we breathe. The air we breathe contains O2, two oxygen atoms bonded together. O2 is used by our bodies to break down ATP for energy, recombining and resulting in CO2 and other byproducts. Those O atoms that made up O2 are still there, now just bonded into CO2 molecules.
Biology and chemistry, not alchemy. Compounds changing, not elements.
Unless you want to define alchemy erroneously and way more broadly. In which case every time I take a shit, I'm an alchemist because I'm taking food molecules, pulling some things out of them, and discarding the changed output.
It’s still certain amounts of one thing becoming another thing.
That's not alchemy. Alchemy was changing elements, specifically not-gold metals into gold, not just molecules.
You can turn copper + zinc into brass, but the atoms of copper and zinc still exist within brass. You can't turn a copper atom into a zinc atom.
You can mix gold atoms with something else to make a gold alloy, you can't change gold atoms into something else or vice versa.
If you were to eat one though, and then you pooped it out, is it still the metal it started out as, complete with its original magnetism?
Do you know the difference between an atom and a molecule? I can't tell if you're just trolling at this point.
It's elements (atoms) that have inherent properties such as magnetism. Is this not true?
If I have a rock that has metal inside of it, is it not the metal itself, inherently in its chemical (atomic) status that causes it to not be magnetic?
And would this in turn mean the only way for it to not be magnetic be that it changes into another element?
Now suppose a small child eats this small pebble with metal in it. They have a very bad time in the bathroom as a result, but eventually it comes out. As poop of course. And you put a magnet up to the poop or the child, and nothing happens. No magnetism. Where did it go?
I am not trolling, I am a questioner and might be questioning myself right now had it not been for the same attitude of people who like to point and say "flat earther" to get out of there being disagreement.
Nooooo, that's not what an atom is. Compounds (substances made of atoms from more than one element), can be magnetic. Like rare-earth magnets are made of rare-earth elements.
Neodymium magnets are made of an alloy of the following elements: neodymium, iron, and boron.
Samarium-cobalt magnets are made from, you guessed it, the elements samarium, cobalt.
I think you should revisit some chemistry resources. You're missing some fundamental concepts.
Hearing of everything now, I doubt I'd understand any of them if they take the same approach.
Magnetism is a force which is generated by the motion of electrons within atoms. Electrons orbit the nucelus of atoms and some metals, such as iron are ferromagnetic. Magnetic fields are generated due to their magnetic moment, and these fields interact with other things that also have magnetic moment.
Electrons have a property known as quantum mechanical spin. This creates what is known as a magnetic dipole moment. In non magnetic materials, the moments in the material are in a random arrangement, often pointing in opposite directions and cancelling out the magnetic fields they generate. With magnetic materials, particles have spin in a particular direction, resulting in magnetism, and the magnetic fields are cumulative.
With metals, such as iron, there are unpaired electrons and they spin in the same direction, and the field they generate is cumulative, so you get a metal that is attracted to or repelled by magnets.
Elements can be changed into other elements through nuclear reactions, but this wouldn't be possible through more simple means. If you ate a chunk of iron for instance, it would remain as iron. Rather than being a solid piece of iron it'd be fragmented and dispersed throughout the body so it depends on how sensitive your tools are for detecting magnetism.