Prediction: The Cucl, crystal will dissolve in water. If we write the solvation process as a chemical equation, we can predict two possible outcomes:
a. Cuci
H2O Cu?* (aq) + 2 Cl(aq)
H2O Cu2+ (aq) + Cl2(9)
+ 9
.
b. Cuciz
In equation (a) Cl' ions remain dissolved in water whereas in equation (b) the chlorine molecule CI,
forms and leaves the solution as a gas. Which outcome do you expect (a or b)? Explain your reasoning.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.