An example can be perspiration or even rain.
Hope this helps.
The valence electron ring is full. The ring has 8 electrons already.
The mass of magnesium should be less than 0.09g to enable a faster reaction rate. Magnesium reacts to form a white coating around it which stops the reaction. The lesser the gram the faster the reaction before the coating is formed. It is also advisable to use magnesium fillings to increase the rate of reaction.
