A magnesium atom has 12 electrons. ______, True, False, There are 8 electrons in the third shell of a magnesium atom. ______, True, False, Magnesium is in Period 3 because it has 3 electron shells. ______, True, False, Magnesium has more electrons in the second shell than in the first shell. ______, True, False, Magnesium belongs to Group IA. ______, True, False, The valence shell is the shell closest to the nucleus. ______, True, False, There are 2 electrons in the second shell of a magnesium atom. ______, True, False

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