Elements are arranged in the periodic table in order of increasing atomic number ... up to a maximum of 8 electrons (only true for the first 20 elements). Example: sodium has the electron ...

Photo: Niels Bohr's research notes for his new atomic ... elements. The shells in which electrons orbit have different quantum numbers and hold only certain numbers of electrons -- the first ...

"Neon, as has been already pointed out, consists of isotopic elements of atomic weights 20 and 22 ... it should do much to elucidate the ultimate structure of matter. On the other hand, it ...

It's what makes one element different from another. The number of protons in an atom is called its atomic ... first shell.The remaining 6 electrons will go into the second shell. The electronic ...