Why is it so easy for magnesium atom to lose two electrons ?

 Atoms want to be like a "noble gas" with a filled outer shell. I think it has to do with being in a stable state. For Mg, it's a lot easier to drop 2 electons to look like Ne rather than gain 6 to look like Argon.  

therefore ,by electric configuration we get

As the no. of atoms is less than 5 it is easy to lose from gaining as it took some more difficulties!!!

hope its help!!✌✌✌✌✌