[Zer0 (OP)]

Is an Atom still Indestructible?

[Kryptid]

No. Radioactive decay breaks atoms apart naturally.

[evan_au]

"Atom": Greek for "Not Cut(table)"

The original idea of Democritus was philosophical - if you keep cutting things in pieces, you eventually get to something that cannot be cut in pieces: the "atom".

Whether you can cut things in pieces depends on your technology:
- Cutting macroscopic things in pieces depends on how sharp you can make a knife.
- Cutting molecules in pieces depends on how strong you can make acids (many new elements found by Alchemists in the middle ages)
- Separating electrons and the nucleus depends on how strong you can make an electric field (around 1800s)
- Separating components of the nucleus depends on particle accelerators (1900s - if you ignore natural decays)
- Distinguishing the quark components of triquarks (protons and neutrons), diquarks and tetraquarks is possible with the highest-power accelerators - but completely separating quarks is not possible with current technology
- Are the electron and quark truly fundamental  and uncuttable - the true "atoms"? Only time will tell.

https://en.wikipedia.org/wiki/Democritus#Atomic_hypothesis

[Halc]

Is an Atom still Indestructible?

Technically, all you have to do is heat it up quite a bit (or put it in a strong electric field as mentioned above).
At a certain temperature, it turns to plasma, kind of like boiling turns liquid into gas. Plasma is the same element but with the electron stripped away, and a nucleus without its electrons is no longer an atom. But let it cool and the atom will reform.
Splitting an atom (decay, fusion, violence, whatever) is more permanent and the original atom is gone.

[Zer0 (OP)]

If Practically it is Possible to destruct/dismantle/destroy an Atom...
Then, is it Atleast Theoretically possible to construct/assemble an Atom?

Say if i had 3 jars each filled up with protons, neutrons & electrons...
Then mixing up 6p, 6n, & 6e..
Could i Create C?

[Halc]

Then, is it Atleast Theoretically possible to construct/assemble an Atom?

Well of course. Every carbon atom anywhere was constructed at some point. It's not like the universe was born with them.

Say if i had 3 jars each filled up with protons, neutrons & electrons...
Then mixing up 6p, 6n, & 6e..
Could i Create C?

I'm sure it's possible, but there's not really a procedure that a human can do to achieve that.
The jar of neutrons will quickly decay, so you'd have to do it fast if you used that method. The more normal method is just 2 jars of 12 each protons and electrons. That's what's out there, and most of the neutrons get created by combining the protons. Neutrons are stable when combined with protons.

The sun creates ¹²C nuclei in vast quantities all the time, but most of that is due to protons striking ¹⁵N which splits each nitrogen into a helium and carbon nucleus. The new carbon nuclei are destroyed almost exactly as fast as they are created. ¹³C is created is almost equal quantities by the decay of ¹³N, an isotope with a half-life of only about 10 minutes. Point is, most of the carbon created doesn't stay carbon for very long.
Most of the nuclei are not atoms since it's too hot for atoms to form. The electrons only combine with the nuclei to form actual atoms if it is all cooled enough, like on Earth. So the jar of electrons is added after the 12 protons are combined via whatever smashing one cares to do.
The sun is such a violent place. Anything you build there (a house say), probably won't last long.

[evan_au]

By combining protons with electrons, you would make Hydrogen atoms.
- In fact, your jar of protons will probably grab a few electrons from the jar it is in (or the air inside the jar)
- If you "pour" your neutrons into the proton jar, you might form some Deuterium atoms (but you had better be quick - glass does not hold neutrons very well)

However, getting to the next elements (Lithium and Helium) doesn't occur at all rapidly under standard laboratory conditions (25C, 1 atmosphere pressure), because protons repel each other strongly due to their positive charge.
- Physicists have had some success at producing Helium with temperatures of millions of degrees, and pressures far higher than atmospheric pressure...
- Producing carbon requires even higher temperatures and pressures...

[Zer0 (OP)]

Thank You All for your Detailed Responses.
Much Appreciated.

Wish One of U, or Y'all could have possibly collaborated & Created an Atom.

I had read about individual Protons being used for Nuclear Fuel Enrichment.
Also read about individual Electrons used for Double Slit Experiments.

Surely You folks could make out a workable instrument to shoot 1p from one end and 1e from the other, and end up with an H in the middle.

P.S. - I'd Love to click on clickbaits from pop sci magz stating...
" Scientists turn into Demi-Gods by Creating an Atom! ".
(doo itt...doo itt)

[evan_au]

a workable instrument to shoot 1p from one end and 1e from the other, and end up with an H in the middle.

"Shoot" is a very emotive word.
- Old-fashioned vacuum-tube TVs could be said to shoot electrons at a phosphor screen, often accelerated by voltages up to 25,000 Volts DC.
- The drift tubes of a particle accelerator effectively build up a DC voltage of TeraVolts by using AC (and shielding the particles during the negative half of the AC waveform)
- However, the highest electron energy transition in a Hydrogen atom (from "infinity" to the n=1 shell)  has an energy of just 13.6 eV
- So, rather than shoot electrons and protons at each other using thousands of volts, you need to let them drift towards each other, and they will combine without much encouragement at all.
- In fact, any physical piece of equipment will release particles from an effectively "infinite" distance (considered on the subatomic scale), so just drifting together will attain an effective energy of 13.6 eV.