The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.Jun 5, 2019
What are the horizontal rows on the periodic table called?
Follow Us: The horizontal rows on the periodic table of the elements are called periods. Every element in a period has the same number of atomic orbitals. For instance, hydrogen and helium are in the first period, so they both have electrons in one orbital. The columns on the table divide the elements into groups with the same number ...
What are the electrons in the outer shell of an element called?
The columns on the table divide the elements into groups with the same number of electrons in their outer shells. These electrons, called valence electrons , cause them to share chemical properties.
