The ground state electron configuration for an ion shows the correct number of electrons in the ion.
The question is incomplete, the complete question is;
Write ground state electron configuration for these ions which play important roles and biochemical process in our bodies. (use a noble gas core abbreviation.)
a)Ca^2+
b) Fe^2+
c)Cu^2+
d)Zn^2+
Looking at the ions, we can write their electron configurations in terms of the relevant noble gas core.
For each of the ions, we can write as follows;
a)Ca^2+ - [Ar]
b) Fe^2+ - [Ar] 3d^6
c) Cu^2+ - [Ar] 3d^9
d) Zn^2+ - [Ar] 3d10
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