Hey aviator!

Here is how atom looks: http://2.bp.blogspot.com/_QOi-X-GyYSE/SM1zSt0wkNI/AAAAAAAAAEY/Tp_RQVDNOaM/s320/atom.jpg :))

electron bcause among all the 3 given option electron is the smallest one & present in all the atom

In addition i'd like to say what hydrogen is not part of atom, it is chemical element.
Molecule is larger than atom because it consists from atoms.

Water is a molecule made of hydrogen atoms which consist of electrons.

Hydrogen contains 1 electron & 1 proton, nothing else.
But if you add 1 neutron it becomes heavy a water...the isotope called "deuterium".
Now again if we add 1 more neutron making a total of 2 neutrons we now call it radioactive "Tritium" (it glows in the dark and is used today in all commercial aircraft "EXIT" signs. Take a look next time on a night flight and look above near the overhead exits and they'll be glowing away! Don't worry though it only emits beta radiation and can only pass through a sheet of paper up to six feet away!I know all this because I've had to change the broken gages in the cockpit!... the indicators on the pedestal of the MD-80's...if a pilot or mechanic breaks one of these, hold your breath open a window and let it air out and only handle with gloves. radiation is harmful if ingested only.If on skin wash hands thoroughly.
Also don't try and make bucking bars out of the depleted uranium rudder or alieron counter balance weights,even though it says depleted uranium..it doesn't mean its not radioactive, its just out of the good stuff.. Its radioactive half life is 4.5 billion years then it decays into lead! Which is dangerous in a totally different way. By the way uranium,even though its Alpha radiation can't go through your skin, the only way it will be of significant danger is when you see your friend at work cutting these weights with a bandsaw and not wearing a mask. Wear a mask!,and don't breath in these particles.
These weight are a lot more dense than Tungsten...they make the best bucking bars...but remember to wear gloves when handling.
Also look up Mastinox!...you ever heard of "Strontium",and "Barium"...well if you have to grease the main landing gear struts on a 767..this is one of a few select zerks that take this bright yellow grease. I don't like seeing mechanics with this grease on their cheeks right next to their lips..like I did when I had to warn this guy of the dangers of Barium!
Some radioactive chemicals can be consumed and they will leave the body by natural functions, but if you have any cuts, hang nails, etc and it gets into blood oh boy!,lets just say that I've worked with all these chemicals and more, in my 35 years aircraft experience... Watch out for military "Turco", -aircraft washing soap,its toxic..if you change ignitor plugs don't touch the tips, they're coated with highly toxic "berilium"..plus don't touch them anyway unless they've been grounded out, they contain extremely deadly voltages.if you still use "MEK", man your lucky!...they won't let me use it anymore,they say its highly inflammable and toxic...but its is the only thing that gets the toxic 1422 or(b-1/2)sealant off my hands.If you work with toxic chemicals you'll know, because your top layer of skin starts pealing away like a sunburn, starting with the thumbs and forefingers, but as long as you take the time to put on some rubber gloves (hopefully your not allergic to rubber) you should be fine.
Oh, I almost forgot, always know where they keep the Castor-oil in the small vials in the medical kits for when SKYDROL or LD-4 will get in your eyes! This of all things will cause you extreme pain,and heed this warning don't go to the head until you wash your hands.Wear glasses and mask especially in the wheel well areas, where your exposed to many hydraulic pumps and lines that can crack and MIST!..you don't want to breathe this stuff in either.Nasty!
Oh yeah, don't service any tires with a high pressure Nitrogen bottle! WARNING!, those are for struts or head pressure on the break accumulators,and yes I've done it before... in a pinch but you better know how to work that regulator valve or you could kill yourself when the tire blows.
Also don't breath 100% Oxygen, its bad for you. We humans never breath pure 100% oxygen, its usually diluted to around 79% and the rest nitrogen and argon in the air we breath.It will help with a headache somewhat but only take a few puffs, and now that you wasted the O2 bottle and have to change it, please don't squirt the bottles threads with any lubricants and don't go get a new O2 bottle after just doing a heavy grease job!
Oh, don't key the HF radios when fueling is going on and if you ever change out a fuel densitometers be careful of the radioactive "Americium" 242 pellet inside the Quantity gauging device.
One more thing, stay away from the nose radomes if you want to have kids!sometimes pilots have forgotten to turn off radar.
This has been aerosafety 101.
Hope you enjoyed!

Just one correction, oxygen in the air is diluted to 21% by volume and the rest is nitrogen 78% and small amount of another gases.

Sorry your correct! also I have it wrong about tungstun, its right up there with gold & uranium densities.

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