Which of these statements is not true? question 20 options: atoms of isotopes of an element have different numbers of protons. atoms of the same elements can have different masses. atoms are mostly empty space. the nucleus of an atom has a positive charge. save?

Atoms of isotopes of an element have different numbers of protons. i took the test

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.