It is more difficult to find the valence electrons of transition elements as they have incompletely filled d-subshell and this d-subshell is very close to the outer s-subshell. What about valence electrons of transition and inner transition elements?įor the transition elements and inner transition elements, the case is more complicated. Well, this suits perfectly for the main group elements (i.e group 1, 2 and group 13 to 18), but what about the transition and inner transition elements? Hence, magnesium has 2 valence electrons.
Here, you can see that the highest principal quantum number is 3, and the total electrons in this principal quantum number is 2. The electron configuration of magnesium is 1s 2 2s 2 2p 6 3s 2.
Valence electrons can also be determined as the electrons present in the shell with highest principal quantum number (n).
The magnesium element has 2 electrons in outermost orbit.
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