If Cadmium has an atomic number of 48 and an atomic mass of 112 and it undergoes alpha decay, what is the new element produced? a. Palladium, atomic number: 46, atomic mass: 108

b. Ruthenium, atomic number: 44, atomic mass: 110

c. Tin, atomic number: 50, atomic mass: 118

d. Cadmium, atomic number: 48, atomic mass: 108

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.