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Because, the chemical name for Magnesium is Mg

and the chemical formula for Chlorine is Cl ;

Magnesium has 12 Electons and protons so to make the outer shell of the 2,8,8,2 rule you need to - 2 electrons to make it a full shell. so... Mg now has 10 Electons. and its NEGATIVE.

Chlorine has 17 electons and protons so to make the outer shell of the 2,8,8,2 rule on this one you need to +1 electon in order to make it a full outer shell so .... Cl now has 18 electrons and is POSITIVE.

This is called IONIC BONDING which is the attraction between a + positive ion and a - negative .

Its kinda confusing but i hope this helps(:

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13y ago

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