Which pair of atoms will form an ionic compound? A) One atom of oxygen and two atoms of fluorine B) One atom of calcium and two atoms of chlorine C) One atom of nitrogen and three atoms of fluorine D) Two atoms of nitrogen and four atoms of oxygen

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

d

explanation: