Magnesium and Oxygen are likely to form an Ionic bond.
A metal and nonmetal are bonded together by exchanging electrons. I'm not sure what you mean by "why".
Hope I helped! :)
Answer:
the total number of elections in an atom of cu_65 is 29.
Visible light
Microwaves
Low frequency waves
Radio waves
Remote controls
Cordless phones
And so on!
Hope this is helpfull! :D
~Korey