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(del) (cur) 01:23, 19 March 2007 . . King of Hearts . . 198×178 (7,076 bytes) ({{Information |Description={{Inkscape}}Heliumatom (not to scale) |Source=Image:Atom.png |Date=2005 (converted 2007) |Author=Svdmolen/Jeanot (converted by King of Hearts |Permission=GF)
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General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Standard atomic weight 4. ... Properties In chemistry and physics, an atom (Greek á¼ÏÎ¿Î¼Î¿Ï or átomos meaning indivisible) is the smallest particle still characterizing a chemical element. ...
A subatomic particle is a particle smaller than an atom: it may be elementary or composite. ... In chemistry, valence electrons are the electrons contained in the outermost, or valence, electron shell of an atom. ...