In an atom, the electrons are arranged across the atomic orbitals. Each orbital has a limit of accomodating the electrons and this is given as the electronic configuration, that is 2,8,18,18,32,...
The last atomic orbital occupying the electrons in an atom is known as the valence shell and the electrons in the valence shell are known as the valence electrons.
The valence electrons for the elements in the given compound can be given as:
For nitrogen:
The atomic number of nitrogen is 7
The electronic configuration is given as 2,5
The valence electron of nitrogen is 5
Here, in the given compound N2O3 there are 2 nitrogens, so the total number of valence electrons of nitrogen is 10.
For Oxygen:
The atomic number of oxygen is 8
The electronic configuration is given as 2,6
The valence electron is 6.
Here, in the given compound N2O3 there are 3 oxygens, so the total number of valence electrons of oxygen is 18.
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