Respuesta :

SOFlA

Magnesium [Mg] + Oxygen [O2] --> Magnesium oxide [MgO]

See, When magnesium is burned in air,it reacts with oxygen, here both of them(Mg & O) gets combined with each other, thus it is a combination reaction.

Now, balance this equation first;

  • 2Mg + O2 = 2MgO

Now, as you can see that 2 molecule of magnesium gets combined with one molecule of oxgyen and forms 2 molecules of magnesium oxide. And let us understand how they are bonded with each other;

  • Electrons in Mg: 2,8,2
  • Electrons in O: 2,6

Mg × × • • • •

• O • • O •

• • • •

Mg × ×

  • See,Mg has 2 electrons in its outermost shell while oxgyen has 6 electron in its outermost shell & both of them wants to get stable so, Mg will give its 2 electrons to oxgyen and it will have 8 electrons with it and a charge of +2 on the other hand oxygen will gain these 2 electrons amd it will also get its octet complete with a charge of -2

and as 2 Mg are bonded with 2 oxygen, they will together result in 2 molecules of magnesium oxide.