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Will Magnesium form covalent bonds? why? what are the criterias to form covalent and ionic bonds?

Yes Magnesium does form covalent bonds. Actually in the formation of organometallic covalent compounds it forms polar covalent bond which is very close to ionic bond.For Eg : in grignard reagent Mg-C bond is polar covalent and electronegativity diffrence is 1.24 .
We know for the formation of 
Non-polar covalent  = 0.0-0.4 is the electronegativity difference.
Polar Covalent = 0.4-1.7
ionic = electronegativity difference >1.7

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Magnesium can only form metallic bonds, which are metal with metal and ionic bonds which are formed between metals and non-metals. Covalent bonds only occur with non-metals.There are many types of chemical bonds and forces acting together to bind molecules together. The two most basic types of bonds are characterized as either ionic or covalent. In ionic bonding, atoms transfer electrons to each other. Ionic bonds require at least one electron donor and one electron acceptor. In contrast, atoms that have the same electronegativity share electrons in covalent bonds since donating or receiving electrons is unfavorable.

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