Which of the following equations is balanced? question 2 options: na + 2cl2 → 2nacl na + cl2 → nacl 2na + cl2 → nacl 2na + cl2 → 2nacl

 The equation which is  balanced  is

2Na  + Cl2→  2  NaCl

 Explanation

According to the law  of mass   conservation in a chemical reaction, the  number  of atoms  in the reactants  side   must  be   equal  to    number of  atoms in  product  side.

The  reaction above  is balanced since   it  obey the  law of  mass conservation.

 for example  there  is  2 atoms of Na in  reactant  side and 2 atoms of Na  in  product side.

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.