Elements in the same column or group have the same number of what?
Elements in the same column or group have the same number of valence electrons.
Elements in the same column or group on the periodic table have the same number of valence electrons.
Elements in the same column or group in the periodic table have the same number of valence electrons. The number of valence electrons is the number of electrons in the outermost energy level of an atom.
To determine the number of valence electrons for an element, you can refer to the periodic table. Each column is labeled with a number, which represents the number of valence electrons. For example, elements in Group 1 (called the alkali metals) have 1 valence electron, while elements in Group 2 (called the alkaline earth metals) have 2 valence electrons.
Remember that the periodic table is divided into groups (vertical columns) and periods (horizontal rows). Elements within the same group have similar chemical properties due to their shared number of valence electrons.