Sulfur
The most common ion is S2-.
The elements with a s2 p3 electron configuration are located in the 5A (or 15) column of the periodic table: nitrogen, N; phosphorus, P; arsenic, As; antimony, Sb, and bismuth, Bi.
By the position of an element on the periodic table you can tell how many protons the element has in it by looking at the number above the elements symbol. You can also find the electron configuration with that same number then you can and you can you can also tell if it is f1, f2,f3...s1,s2,d1,d2...
A sulfide ion will have a charge of -2. This is because sulfur is in Group 6 of the periodic table and typically forms ions by gaining two electrons to achieve a stable, noble gas electron configuration.
S^2- is larger in size compared to O^2-. This is because sulfur is lower in the periodic table than oxygen, and as we move down a group in the periodic table, the atomic size generally increases.
Elements in Group 2 of the periodic table will have an electron configuration that ends in s2. This group includes elements such as beryllium, magnesium, and calcium. They have two electrons in their outermost s sublevel.
The atom in row 3 of the periodic table that is likely to form a -2 ion is sulfur (S). Sulfur is in group 16 and can gain two electrons to achieve a stable electron configuration.
S2- ion: [Ne]3s23p6
Magnesium is located in Group II in the periodic table. Every element in Group II will form an ion with the charge of 2+ by losing two electrons. Hence, magnesium will form the magnesium ion: Mg2+. Sulfur is located in Group VI in the periodic table. Every element in Group VI will form an ion with the charge of 2- by gaining two electron. Hence, sulfur will form the sulfur ion: S2-.
Definition: A set S1 is a superset of another set S2 if every element in S2 is in S1. S1 may have elements which are not in S2.
The element that fits this description is sulfur. Its most stable ion is the sulfide ion (S2-), which contains 18 electrons. Sulfur belongs to the same group as oxygen on the periodic table (Group 16 or 6A), known as the chalcogens.
In chemistry, "ide" refers to an anion composed of two elements, where the second element is from Group 6, 7, or 0 on the periodic table. These anions typically have a negative charge. Examples include chloride (Cl-), oxide (O2-), and sulfide (S2-).