An atom has 36 protons, 36 electrons and a mass number of 80. How many neutrons are in this atom?

44 neutrons

Explanation:

To find the neutrons of an atom subtract the atomic number from the mass of the atom

in this case

80-36=44

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.