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tht means the max no. of electrons in the first shell is 2. the max no. of electrons in the second shell is 8. and the max number of electrons in the third shell is 8....it goes on as the no. of electron in the atom increases. so the electron configuration for magnesium is 2.8.2. this shows tht the first and second shells are filled to the max. the third shell isn't. it has a 2+ charge because it has lost 2 electrons( which carries a negative charge), hence the atom is more positive than normal.
In addition, we can also look at the two elements on the periodic table and notice that chlorine is a non-metal with a charge of -1 and magnesium is a metal with a charge of +2. This means that the two combine to form an ionic bond, specifically giving us the compound MgCl2. 2.agnesium forms a positive ion (cation) with a 2+ charge and chlorine forms a negative ion (anion) with a 1- charge. So two chlorine anions form an ionic bond with one magnesium cation for form MgCl2, a neutral chemical compound.