Hydrogen is by far the most common element in the universe out of all the known matter there is, representing 75 percent of all known matter. On the periodic table, hydrogen is first, with one proton and one electron. In the world, the simplest thing is that. Number two, helium, on the periodic table, comprises around 23 percent of the substance of the universe. That means that the last 2 per cent of the matter is basically everything else you know!
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