This is pretty much universally true in all of physics and chemistry, where as, the forming of bonds releases heat. I think a much simpler way to say to look at all of this, as I said above, is that heat breaks bonds. Second, Neutrinos very rarely react with Hadrons (and it's probobly better to use the word Baryon in this sense than Hadron, Baryons are a class of Hadron). Well, first, Photons aren't Leptons at all. These leptons, which include electrons, neutrinos and photons, would soon be able to join their hadron kin in a union that would define present-day common matter." "Although lighter particles, called leptons, also existed, they were prohibited from reacting with the hadrons to form more complex states of matter. Particles are defined by Charge, Spin and Mass, and quarks also by color, and there's also anti particles, which, when an antiparticle and a particle meet, they annihilate in a flash of heat/light - so the early universe was very very hot and heat tends to prevent bonds from forming, even very small, very strong bonds inside an atom - but as the universe cooled, bonds began to form and that meant, Protons and Neutrons and later, some simple nuclei like deuterium and helium and later, when it cooled enough Electrons could bind with Nuclei and you had atoms. Anyway - a glance at the standard model will help with the 3 categories: The Higgs field creates a Boson too, but that's a little more complicated and probobly best left for later. Leptons include the very useful Electron as well as Neutrinos and Bosons are essentially binding particles, and/or energy transfer particles - also very useful. Quarks form Baryons and Mesons, (there's probobly a Free Meson joke to be made, but I'll try to resist). It might help to look at the standard model as there's 3 main categories: Quarks, Bosons and Leprechauns, I mean, Leptons (just checking to see if you're paying attention). I'm willing to guess, what he/she meant to say these "common particles" included Baryons, Photons, Neutrinos, Electrons and Quarks", cause to say Baryons include photons is incorrect. These particles are called baryons and include photons, neutrinos, electrons and quarks would become the building blocks of matter and life as we know it. "As the universe expanded further, and thus cooled, common particles began to form. The first sentence you quoted - as pointed out, is incorrect, or, at least, said badly. I like this one better, as it has pictures: I don't really like summaries like that cause there's too many short-cuts taken in the summary - but that's my personal take, you don't have to share that opinion. What is the difference between leptons and baryons? Notice that electrons, photons and neutrinos now fall into the lepton category. These leptons, which include electrons, neutrinos and photons, would soon be able to join their hadron kin in a union that would define present-day common matter. Although lighter particles, called leptons, also existed, they were prohibited from reacting with the hadrons to form more complex states of matter. Still, no matter more complex could form at these temperatures. Composite particles such as protons and neutrons, called hadrons, became the common state of matter after this transition. These particles are called baryons and include photons, neutrinos, electrons and quarksĪfter the universe had cooled to about 3000 billion degrees Kelvin, a radical transition began which has been likened to the phase transition of water turning to ice. I am learning about the formation of the first atoms and, from what I am reading, before heavy particles, like neutrons and protons could form, there were already other types of particles, called baryons that existed.
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