An 80.0 g sample of metal, initially at 96.0°C, is placed into 150. g of water initially at 26.0°C in a calorimeter. The final temperature of the water is 28.1°C. What is the identity of the metal? (The specific heat of water is 4.18 J/g･°C.)

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

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.