Help please Balance the following reaction and determine the coefficients for the reactants and product/s.
___ Mg + ___ O2 → ___ MgO

1.) 1,1,2
2.) 2,2,1
3.) 2,1,2
4.) 1,1,1
Please explain how you did this so I can do the others.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.