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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.
Magnesium is located in Group II in the periodic table. Every  element in Group II will form an ion with the charge of 2+ by  losing two electrons. Hence, magnesium will for â¦ m the magnesium ion:  Mg2+. Sulfur is located in Group VI in the periodic  table.Every element in Group VI will form an ion with the charge  of 2- by gaining two electron.  Electrons are negative. To have a ne â¦ utral atom, you must have the  same number of electrons as you do protons.    So if Sulfur loses a single electron, it's losing some negativity,  meaning Sulfur will be more positive.   If it loses two, then it becomes even more positive.