# Is the equation, 2Hg + O_2 = 2HgO a synthesis, decomposition, or exchange reaction?

The equation $2 H g + {O}_{2} \to 2 H g O$ is under the form of:
$\text{Element "+" Element} \to P r o \mathrm{du} c t$ which is the general form of a synthesis reaction.
It is similar to $2 {H}_{2} + {O}_{2} \to 2 {H}_{2} O$ for the synthesis of water.