Answer
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Step 1
In the case of a nitrogen (N) atom, which has 7 electrons, we need to add 3 electrons to form an anion with a -1 charge, denoted as N${}^{-}$.
To form an anion, electrons are added to the neutral atom.
Step 2
The atomic number of nitrogen is 7, which means it has 7 protons in its nucleus. The principal quantum number (n) for nitrogen is 2, as it has a full 1s subshell and 2s and 2p subshells that can accommodate more electrons.
Final Answer
The 2p subshell is added to form an N${}^{-}$ anion.
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