Periodic Table Groups And Columns. Each element is placed in a specific location because of its atomic structure. Mendeleev put elements with similar properties and that react in similar ways into the same.
The most common way the periodic table is classified by metals, nonmetals, and metalloids. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. The columns on the periodic table of elements are called groups.
The key difference between periods and groups is that the periods are horizontal rows whereas the groups are the vertical columns in the periodic table of chemical elements.there are 7 major periods and 18 groups in the periodic table of elements.
Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. * elements in the same group are similar to each other. This is what is meant by periodicity or periodic table trends.
