How is 2Mg+O2= 2MgO balanced?

A half-reaction can be written to represent reduction. At the same time the magnesium atoms become ions, the oxygen atoms become –2 anions by gaining one electron each. By combining these two reactions, we have an oxidation reaction and a re- duction reaction, that are perfectly balanced.

Explanation:

Regroup terms.

2Mg+2O=2mgo

Subtract 2Mg2Mg from both sides.

2O=2mgo-2Mg

Factor out the common term 2.

2O=2(mgo-Mg)

Cancel 2 on both sides.

O=mgo−Mg

cc jyfu65   6r 67r   r576dyfu r6tyuio fghjkl;

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).