The last piece of chemistry for right now is to know about hydrogen and helium. Hydrogen is the simplest atom, containing only one proton and one electron. Helium is also very simple, containing two protons, two neutrons, and two electrons.
Hydrogen is the simplest atom, containing only one proton and one electron. Helium is also very simple, containing two protons, two neutrons, and two electrons.
http://www-astronomy.mps.ohio-state.edu/~ryden/ast161_5/notes20.html
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