Elements in the same group of the periodic table have
Answer Details
Elements in the same group of the periodic table have the same number of valence electrons. This is because elements in the same group have the same outermost electron configuration, which determines their chemical properties. For example, all elements in group 1 have one valence electron, which makes them highly reactive and likely to lose that electron to form a cation with a charge of +1. Similarly, all elements in group 17 have 7 valence electrons, which makes them highly reactive and likely to gain one electron to form an anion with a charge of -1. Therefore, elements in the same group have similar chemical behavior, but different atomic sizes and electron shell numbers.