Word: chargeless
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...justify the confidence physicists have placed in the so-called Standard Model, a powerful theoretical edifice that has reduced a once bewildering array of subatomic particles to just a few fundamental constituents. These include three pairs of light particles known as leptons, of which the negatively charged electron and chargeless neutrino are the most familiar, and three pairs of heavier particles known by the whimsical name of quarks. "Up" and "down" quarks combine to create protons and neutrons, the components of everyday matter, while "charm" and "strange" quarks conspire to make more exotic particles, the sort produced in deep space...
Ordinary conductivity, the measure of a material's ability to transmit electrical current, is determined by events that take place at the atomic level. Atoms consist of a tiny dense nucleus that contains positively charged protons and chargeless neutrons. Around the nucleus whirl the negatively charged electrons, residing in shells with shapes determined by the electrons' energy levels...
Muon transmissions may point the way to a more dazzling form of communication. The large "zoo" of subatomic particles, as physicists call it, includes an even stranger will-o'-the-wisp called the neutrino: a virtually massless and chargeless bundle of energy. That tiny particle can pass through matter of any thickness, including the entire earth. Furthermore, regardless of how many neutrinos there might be in a beam, they would present no radiation hazard. Thus if a neutrino transmission and detection system could be developed, the elusive particle might prove to be an even better answer...
Most of these antiprotons were "annihilated" (turned into energy) when they hit an ordinary positive proton. But occasionally, when an antiproton passed close to an ordinary proton, it merely handed over its negative electric charge. The proton, its positive charge neutralized by a negative one, became an ordinary, chargeless neutron. The antiproton, having lost its negative charge and received nothing in return, also became a chargeless particle, but it did not become a normal neutron. Since its basic "anti-ness" was not changed by the loss of its charge, it became an antineutron with a reversed magnetic field...
...they work in exactly the same way to destroy living cells. They are created when a powerful electric current-i.e., a stream of electrons -jumps through a vacuum tube and hits a "target,", usually a piece of tungsten. The electrons batter from the tungsten a secondary stream of chargeless particles, X-rays, whose wave lengths are thousands of times shorter than those of ultraviolet light and almost as short as those of radium's gamma rays. The shorter waves are the farther they penetrate into matter before their energy is dispersed. The stronger the voltage the shorter...