We have an initial measurement of 16mL of H2O in a Graduated Cylinder, we add a sample of Gold (element symbol Au) and receive a measurement of 24mL. What is the volume of the sample of Gold (Au)?

the answer is option a.

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.