The schnitzel turned to leather in my mouth, the beer seemed tepid; I left the Emmenthaler untasted. Reginald in Russia Saki. Fernando was a man who had almost as little to say as had schnitzel. The Khaki Boys at Camp Sterling Josephine Chase.
The inner shells of an atomâs electrons are full and stable. For the most part, they contribute little to the way the atom reacts. The largest factor in how an atom reacts is the makeup of its outer shell electrons. The periodic table naturally groups together elements with similar outer shells (Transition metals, halogens, etc.).
There are 18 columns on the periodic table. The first 2, and 13-18 are all grouped by how many valence electrons the outermost ring of an atom has. Therefore, the elements in the columns all have similar properties. There are also other ways they are grouped. They are arranged in number order.