Common Cations and Ion Reference Guide

In Source 1 (Common Cations and Ion Reference Guide), the statement at the top refers to the standard ionic charges formed by elements in Group 1 and Group 2 of the periodic table when they form cations:

• Group 1 Elements ($+1$): Alkali metals (such as lithium, sodium, and potassium) lose one valence electron to achieve a stable electron configuration, forming cations with a charge of $+1$ (e.g., $Na^+$ or $K^+$).

• Group 2 Elements ($+2$): Alkaline earth metals (such as magnesium, calcium, and barium) lose two valence electrons, forming cations with a charge of $+2$ (e.g., $Mg^{2+}$ or $Ca^{2+}$).

This rule allows you to quickly determine the charge for any Group 1 or Group 2 metal without needing each one explicitly listed in the reference table.