The number of protons (in nucleus) or the number of electrons in a neutral atom.
It is Uranium Hexafluoride but known in the industry simple as HEX
The only "original" matter after the Big Bang was hydrogen, a little bit of helium, and a tiny trace of lithium. EVERYTHING heavier that that - carbon, nitrogen, oxygen, iron, lead, gold or uranium - was formed in stars. Every single atom on Earth - including every single atom of YOU - is recycled star-stuff.
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Liquid helium in the helium I phase boils at about 5 K, lower than any other substance. (Liquid helium in the helium II phase does not boil, it simply evaporates. Helium is truly weird stuff at very low temperatures.)
Hydrogen is the most common element in the universe and it is in a class of its own as it is the simplest and lightest element, consisting of only one proton and one electron. It is found in stars, gas giants, and interstellar space.
black and stuff
A particle is part of a element, and the element has particles in it. A particle is like a small tiny object and a element is stuff combined.
Well, darling, the element with 5 nucleons is good ol' Boron. It's got 5 protons and 5 neutrons chilling in its nucleus, making it a total badass in the periodic table. So, if you're looking for an element with just the right amount of nucleons, Boron is your go-to guy.
Acids,element,metals,chemicals and other stuff
Elemnts are pure in the sense that they are mad eup of one thing and can't be simplified. An element is determined by how many protons it contains, if you change the number of protons (atomic number) you change the element. Compounds are more then one element ionicly or covalently bonded together. Water, H2O, is a compound and can be broken down into 2 hydrogens and one oxygen.
Helium because helium is the lightest type of air in the period table of elements. Oxygen is next, because we breathe it and it helps life to live, but it can suffocate plants. Helium is made for balloons, and so much more.