MCQ
Determine the element if its ground state has $13$ electrons in its "$M-$ shell".
- ACopper
- ✓Manganese
- CNickel
- DIron
✓
Answer
Correct option: B.
Manganese
The $M$ shell is the third energy level; the first $(K)$ shell can contain only $2$ electrons. The second $(L)$ shell can contain up to $8$ electrons, for a total of $10$. The third $(M)$ shell can contain up to $18$ electrons, but when it gets to $10,$ the fourth or $N$ shell starts to fill up, since its first two electrons have lower energy than the next energy level in the M shell, so we have $18$ electrons in the $K, L,$ and $M$ shells and the next two go into the $N$ shell $($for element $20,$ or calcium$)$. So calcium has $10$ electrons in the $M$ shell and two in the $N$ shell; then the next electrons go into the $M$ shell $($the $3d$ orbitals) so when we get to a total of $25$ electrons, we have $10$ in the $K$ and $L$ shells, two in the $N$ shell, and $13$ in the $M$ shell. If it is a neutral atom, the element has atomic number $25,$ that is, manganese.
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