We are asked to find the identity of the +2 ion for the given valence electron configuration:
Recall that every single element in the periodic table has a corresponding atomic number.
The atomic number of an element is always equal to the number of protons of that element. And when the element is neutral (charge = 0), the number of protons is equal to the number of electrons.
Neutral element: Atomic number = # protons = # of electrons
The orbital diagram that follows shows the valence electrons for a 2+ ion of an element.
What is the element?
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