Is a purely Electron or Proton bomb possible? Since electrons repel other electrons and protons repel other protons, if you had enough of either of these in an enclosed space, and suddenly removed the enclosing barrier, would the repelling force between the particles release enough energy to cause significant effect? How many particles would need to be present to equate to a regular stick of dynamite?
 A: Proton-Proton Bombs
Protons repel each other electromagnetically, but that repulsion is weaker than the strong force attraction between protons at short distances, so the focus is on reducing the total binding energy of a nucleus in the end state relative to the starting state via nuclear fission or nuclear fusion. A proton-proton bomb is basically an A-bomb like the one used in Hiroshima and Nagasaki (or a later H-bomb). The first A-bomb used in anger called "Little Man" weighed 9700 pounds of which 140 pounds was warhead, and had a yield equal to 60,000,000 sticks of TNT (which have half a pound of TNT each).
An A-bomb which relies on nuclear fission of atoms like uranium (with 92 protons) and plutonium (with 94 protons) isn't a truly pure example of a proton-proton bomb because these isotypes also have lots of neutrons that contribute to the binding energy.
A more pure example would be an H-bomb which fuses hydrogen-1 atoms (basically protons with an electron around them) with an igniting detonator into helium. This is quite doable technologically as an uncontrolled one time reaction, even though doing so efficiently on a sustained basis in a controlled manner to generate energy for practical energy production is not currently technologically feasible.
The yield of an H-bomb is even greater per pound of warhead mass than an A-bomb, although basically similar at a gross order of magnitude level. For example:

The W47 [thermonuclear warhead] was 18 in (460 mm) in diameter and 47
in (1,200 mm) long, and weighed 720 lb (330 kg) in the Y1 model and
733 lb (332 kg) in the Y2 model. The Y1 model had design yield of 600
kilotons and the Y2 model had a doubled design yield of 1.2 megatons.

The Y2 was equivalent to 4,800,000,000 sticks of dynamite from a 733 pound bomb warhead.
Electron-Electron Bombs
The problem with an "electron-electron" bomb is containing the electrons prior to the bomb being used arriving at its target. You would need some sort of magnetic containment field, which would take heavy materials to generate, and would leak due to quantum tunneling (the leaking would get worse at the electrons were packed more tightly). Also, electrons packed into each other would tend to collide and produce new particles much like they would in a particle accelerator. The explosive force upon releasing the electrons would depend both upon how tightly the electrons were packed and upon their kinetic energy within the containment area.
So, the explosive force would depend very much upon the design of the bomb, and it might not be feasible at all as a weapon.
A more fruitful and conventional approach to an electron weapon would be to shoot a stream of very fast moving electrons towards a target like a ray gun. This is what happens inside an old school CRT screen but at a non-weaponized energy scale.
