Final answer:
The ion formed from the sulfur atom is called a sulfide. The element that does not form an ion with a charge of +1 is Fluoride. The chemical properties of an element are largely determined by the number of valence electrons they have.
Step-by-step explanation:
The ion formed from the sulfur atom is called a sulfide. Sulfide has a charge of 2- because sulfur gains two electrons to achieve a stable noble gas electron configuration.
The element that does not form an ion with a charge of +1 is Fluoride. Fluoride has a charge of -1 because it gains one electron to have a stable noble gas electron configuration.
The chemical properties of an element are largely determined by the number of valence electrons they have. Valence electrons are the outermost electrons and are responsible for an element's reactivity and ability to bond with other elements.
In order to obey the octet rule when reacting to form compounds, magnesium gives up electrons. Magnesium has 2 valence electrons and can lose those electrons to achieve a stable octet configuration.
Strontium has to give up 2 electrons to achieve a noble gas electron configuration. Strontium has 2 valence electrons in its outermost energy level and loses those electrons to achieve an octet configuration.