Question

in a 1:1 ratio, which of these pairings would create an octet for each atom? one sulfur atom and one calcium atom one nitrogen atom and one strontium atom one oxygen atom and one aluminum atom one sulfur atom and one lithium atom

Explanation:

An octet is achieved when an atom has 8 valence - electrons. Sulfur has 6 valence electrons and calcium has 2 valence electrons. In a 1:1 ratio, calcium can transfer its 2 valence electrons to sulfur. Sulfur then has 8 valence electrons and calcium has an empty outer shell (a stable noble - gas like configuration). Nitrogen needs 3 electrons to complete an octet and strontium donates 2 electrons, not a good match. Oxygen needs 2 electrons and aluminum donates 3 electrons, not a 1:1 octet - forming pair. Sulfur needs 2 electrons and lithium donates 1 electron, not a 1:1 octet - forming pair.

Answer:

one sulfur atom and one calcium atom