This question cannot be answered without a lot of additional information. At the least:
Several other details, that I can't discuss, also must be known.
no, hydrogen has the smallest size among all elements
The largest biological level among the given options is organ
hydrogen
biological
No. The hydrogen bomb is the most powerful bomb in the world. The first atomic bombs split atoms of Uranium and/or Plutonium. Later development in theory and technology have made the Hydrogen bomb possible. This is in fact a 'normal' atomic bomb with a core of hydrogen. When the Atomic bomb goes off, this create an immense pressure on the hydrogen. This pressure (and heat) causes a fusion reaction of Hydrogen atoms. A 'relatively' small atomic bomb can trigger a quite large payload of hydrogen fusion material. Further developments of this massive destructive weapon has been to implement yet another core with radioactive material filled with more hydrogen. This inner core get super compressed by the first explosions, something of which drastically adds to the speed of material being consumed. Explosion being amplified tenfold. All such powerful devices are named 'nuclear' devices or nuclear bombs. Some are mostly a fission bomb, and others are mostly a fusion bomb. The fusion bombs are more powerful than fission bombs alone when comparing size and weight of 'stuff that go boom' Both fission and fusion bombs are considered atomic bombs, and their kind is among the most powerful devices known to man today. In theory, it should be possible to make an Antimatter payload. Something like a few grams could rival the energy released by the most powerful bombs today.
cell
false. floods are among the most deadly and most destructive of all geologic hazards. pg.132 Earth science
Amines Biological agents include bacterial, parasitic, fungal, viral, and Rickettsial/Chlamydia.
diammonium hydrogen phosphate
They all have protons and electrons. And all but hydrogen have neutrons as well. The number of protons is an element's atomic number. Assuming the atom is neutral, this will also be the number of electrons. The number of neutrons can vary among isotopes of the same element.
Atomic radius increases down the group. So indium will have the largest atomic radius among the options given.
Hydrogen is necessary to the human body, along with oxygen, phosphorus, sulfur, and nitrogen, among others.