According to the periodic table, which element will most likely form an anion (-) calcium iron chlorine sodium

An anion is a negatively charged ion. In the periodic table, elements that are more likely to form anions are those that have a high tendency to gain electrons to achieve a stable electron configuration. This tendency is related to the element's position in the periodic table, particularly its group number. Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons. <br /><br />Calcium (Ca) and sodium (Na) are both in Group 2 of the periodic table, which means they have two valence electrons. They are more likely to lose these electrons to form cations (positively charged ions) rather than gaining electrons to form anions.<br /><br />Iron (Fe) is a transition metal and can form various ions, but it is not typically known for forming anions.<br /><br />Chlorine (Cl), on the other hand, is in Group 17 of the periodic table, which means it has seven valence electrons. It is one electron short of having a full outer shell, which is a stable configuration. Therefore, chlorine has a high tendency to gain one electron to achieve this stable configuration, making it likely to form an anion.