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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.
Why the magnesium atom has a neutral charge? Well...the magnesium atom has a total of 12 electrons in a 'cloud' around its nucleus, which happens to have exactly 12 protons. Each electron has a charge of -1, and each proâ¦ton a charge of +1. So, the total charge of the electrons (-12) exactly cancels out the total charge of the protons (+12)...and that's why the magnesium atom has a neutral (0) charge! Making the world better, one answer at a time.