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Magnesium has a full outer shell because it says +2 for Mg, which means it loses 2 electrons. It leaves Mg with an outer shell of 8 electrons, which is a full valence shell.
Mg+2 among the following has the full outer shell , therefore option (d) is correct.
What do you mean by outer shell ?
A full outer shell is known as the noble gas configuration where the outer shell of an atom is energetically stable and contains 8 outer electrons .
It belongs to a group called the noble gases. When the outer shell has the maximum number of electrons, the electron shells. are said to be full.
The inner shells of an atom are always full. If the outer shell of an atom has less than , its maximum number of electrons then it will not be stable.
Elements with complete outer shell are Helium , Neon, Argon, Krypton , Xenon , Radon .
Mg+2 among the following has the full outer shell ,hence option (d) is correct .
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