The valence electron of the atom is 5
Valence electron(s) are electrons located on the outermost shell of an atom.
From a detailed understanding of arrangements of electrons around the nucleus of an atom, we discovered that the 1st shell can hold a maximum of 2 electrons while other shells a maximum of 8 electrons.
From the question given above, the atomic number of the atom is 7. Thus, we can obtain the valence electron as follow:
Atomic number = 7
1st shell = 2
2nd shell = 5
The 2nd shell is the last shell of the atom. This shell contains 5 electrons. Therefore, the valence electron of the atom is 5.
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