How many valence electrons are in N^2-?


Step 1 of 2

Given data: N2− ion is given.

Find: we have to determine the number of valence electrons in the N2−.

Explanation:

we need to consider the electronic configuration of a neutral nitrogen atom (N).

Step 2 of 2

To determine the number of valence electrons in an ion, you can look at the electron configuration of the neutral atom and then adjust it based on the ion’s charge.

A neutral nitrogen atom has an atomic number of 7, indicating that it has seven electrons. The electronic configuration of nitrogen is 1s2 2s2 2p3⋅

Valence electrons are the electrons in the outermost energy level of an atom. For nitrogen, the outermost energy level is the second energy level (2s2 2p3). Therefore, in a neutral nitrogen atom, there are 5 valence electrons.

Explanation:

When the nitrogen atom gains two extra electrons to form the N2− ion, it now has a total of 7 + 2 = 9 electrons.

Final solution

So, N2− has 9 valence electrons.

 

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