1. ___Mg +
O2 → __Mgo
What type of reaction is shown

Explanation:

In first one it should be 2Mg

and in second = 2Mgo

hope it helps

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.