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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.
Mg has 12 protons in its nucleus - these are positively charged Surrounding the nucleus are 12 negatively charged electrons. Because the number of positive charges matches the negative charges, the atom is overall neutral The neutral atom can lose 2 electrons from its outer shell. This leaves 12 positively charged protons, and only 10 negative charged electrons The magnesium ion has 10 electrons and a charge of 2+ . The Mg atom - like all atoms - does not lose protons from the nucleus, in the chemistry that you are studying. It can only lose or gain electrons.