Answer :
No substance's Lewis structure will ever show an unfinished octet.
How to find out incomplete octet?
With fewer than eight valence electrons, certain atoms of specified elements can form stable bonds. When this occurs, the atom of the element included in the molecule is thought to retain a partial octet.
Boron, aluminum, beryllium, and hydrogen are typical examples of these elements, all of which are stable with just two valence electrons (stable with only 6 valence electrons). For all other periods below period 1, this is comparable to the octet rule, with the exception of hydrogen, where a noble gas structure should be assigned two valence electrons instead (like He).
The valence electrons in stable compounds that do not have a noble gas structure can be produced by covalent compounds in groups 2 and 3.
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