Which type of reaction is mg + s → mgs?

a. polymerization
b. synthesis
c. replacement
d. decomposition

i think it's synthesis, but idk

The type  of reaction that is  Mg +S→  MgS  is a  synthesis reaction

  Explanation

Synthesis reaction  as refers to as direct combination is a reaction  in which two or   more chemical   species   combine  to form   more  complex  product.

 The reaction  of  Mg  +S → MgS  is a synthesis  reaction because;

    Mg combine with  S to form a more complex product MgS

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.  

a physical change biology

explanation: