Copper ions are: 1) Gaining electrons and are reduced

2) Lose electrons and are reduced

3) Gain electrons and are oxidized

4) Gain electrons and are reduced

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )