Final answer:
Elements on the left side of the periodic table, particularly from groups 1 and 2, tend to form cations by losing electrons equal to their group number, while transition metals can form cations with variable charges.
Step-by-step explanation:
Areas of the Periodic Table That Contain Elements Forming Cations
Elements that form cations in ionic compounds can be located on the left side of the periodic table. Specifically, groups 1 and 2 elements are prime candidates for forming cations. When these elements form ions, they generally lose electrons equal to their group number. For instance, group 1 elements lose one electron to form a 1+ ion, and group 2 elements lose two electrons to form a 2+ ion. The transition metals, found in the center of the periodic table, can often form cations with variable charges, like iron which can form both Fe²+ and Fe³+ ions.
Understanding the periodic table enhances our ability to predict likely ion formation and charge. The position of an element within the periodic table correlates with the type of ion it forms due to the number of valence electrons. By following the patterns within the periodic table, we can predict that cations are generally formed by elements to the left and anions by elements to the right. However, it is important to note some exceptions, like the variable charge cations formed by transition metals.