Which sample of matter is a mixture

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?

Which best describes eras and periods?