What would be the element with the electron configuration [rn]7s25f7 ?.

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

Calcium chloride +gold(1) oxide—>

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion