about fusion.
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Entropy has two related but different definitions. In chemistry, entropy is the randomness of particles in a system i.e. if you half filled a bottle with CO2 and the other half filled with 02, entropy would be the level of randomness that the particles could have at any one time. In this instance it would be very high. If there was only one particle of each, it would be much lower.
In physics, entropy is the measure of useful energy within a system. The second law of thermodynamics dictates that in an enclosed system, where energy cannot enter or escape, the amount of useful (kinetic, thermal) energy decreases. Basically, it measures the amount of useless energy. The higher the entropy, the more useless energy in the system. Overall in the universe, the entropy is increasing because of applying the first law of thermodynamics (Energy cannot be created or destroyed, meaning no energy is gained or lost).
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Actually only the really light elements can be used in nuclear fusion, uranium and such are for fission, splitting the atoms, not combining
actually only lithium and hydropgen are the only elemetns you've listed, the others are isotopes of hydrogen, also helium can be used for fusion
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If you look at a periodic table, you can see the atomic number(which is the amount of protons). If you take two hydrogen atoms, you get helium, because 1+1 = 2 = HE.
Theoretically all atoms can be fused together to make something else, but as cyberdragon stated, it doesn't quite work like that.
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You need neutrons too though, otherwise you'll just have two protons and two electrons. And that's just silly...
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It's not. It's the second. The new Muse album is named after it. I'm assuming you think the Zeroth law is the First law so everything is +1
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Technically two protons and two electrons are all that's needed for a helium atom, but yes, it would immediatelly fissile if you didn't have any neutrons.
