How is deposition a exothermic reaction?

  all the ones that phase down are exothermic - freezing, deposition, condensation. 

all the ones that phase up are endothermic - melting, sublimation, vaporization 

endothermic is to gain heat, exothermic is to release heat

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility