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.).
Groups and periods are two ways of categorizing elements on the periodic table. Here is how to tell them apart and how they related to periodic table trends. Answer: Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases both as you move down a group or across a period. Elements in a group share a common number of valence electrons.