Tin Chemical Element Tin is a chemical element with the symbol Sn and atomic number 50. It is a main group metal in group 14 of the periodic table. Wikipedia Symbol: Sn Electron configuration: [Kr] 4d105s25p2 Atomic number: 50 Melting point: 449.5°F (231.9°C) Atomic mass: 118.71 u Boiling point: 4,717°F (2,603°C) Electrons per shell: 2, 8, 18, 18, 4
The activation energy for an endothermic reaction is quite large and usually takes extra energy from the environment, it is normally not a natural spontaneous process.
Explanation:
Endothermic reactions require absorbing energy of the surrounding mainly in the form of heat.
Chemical energy needs energy input to break the bonds.
Examples of endothermic reactions: Photosynthesis
, melting of ice
, and evaporating liquid water.
