Group 16 because on the Periodic Table, there are different columns that represent a greater or lesser amount of valence electrons; and group 16 has the amount of 6 valence electrons.
Chemical bonds don't form electrons; an element has valance electrons. Covalent bonds are formed when elements share their valance electrons. An element wants to have 8 valance electrons. That is when it is an "happy atom". For example, carbon has has four valance electons, so it typically bonds with hydrogen and oxygen to get those four valance electrons.
The valence electrons of an atom determine how the element forms chemical bonds with other elements to form chemical compounds.
Magnesium is divalent- it forms two bonds- most often these are ionic, involving the Mg2+ ion.
The group 16 elements have 6 valence electrons. However, they generally only have two unpaired electrons available for bonding.
The elements of V- A group of periodic table form three covalent bonds as Nitrogen forms NH3 and phosphorus forms PH3.
Aluminum typically forms metallic bonds in its elemental form. In ionic compounds, aluminum forms ionic bonds when it donates its three outer electrons to other elements.
covalent bonds
The electrons (especially the valence electrons)
Sulfur can form both ionic and covalent bonds depending on the elements it is bonding with. When sulfur bonds with a nonmetal, it forms a covalent bond by sharing electrons. When sulfur bonds with a metal, it typically forms an ionic bond by transferring electrons.
The pair of elements that forms a bond with the least ionic character is covalent bonds. In covalent bonds, electrons are shared between atoms rather than transferred, resulting in minimal difference in electronegativity between the elements involved.
Elements are able to bond by sharing or transferring electrons to achieve a more stable electron configuration. This can result in the formation of ionic bonds, where electrons are transferred, or covalent bonds, where electrons are shared between atoms. The type of bond that forms is determined by the electronegativity difference between the atoms involved.
Sodium typically forms ionic bonds by donating its single outer electron to another element, while carbon typically forms covalent bonds by sharing electrons with other nonmetal atoms. Sodium tends to lose its electron to achieve a stable electron configuration, while carbon prefers to share electrons for stability.