A researcher find that a compound is composed of 43.6% phosphorus and 56.4% oxygen. In a separate analyst, she finds that it has a mullet molar mass of 142 g/mol. what is the molecular formula of the compound?

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.