Nitrogen is a diatomic molecule and contains only two nitrogen atoms. Lewis structure of N2 molecule contains a triple bond and each nitrogen atom has one lone pair. There are many things to learn when we draw N2 lewis structure.
There is a triple bond between nitrogen atoms and one lone pair exist on each nitrogen atom. There are several interesting steps in drawing nitrogen's lewis structure.
When we draw a lewis structure, guidelines are given. Number of steps in the guidelines can be changed according the complexity of the molecule or ion. Because N2 is a simple molecule, it is extremely easy to draw the lewis structure of it. However those all steps are mentioned and explained in detail in this tutorial for your knowledge.
There is only one element in the nitrogen molecule. Nitrogen is a group VA element in the periodic table and contains five electrons in its last shell. Now, we know how many electrons are there in valence shells of nitrogen atoms.
Total valance electrons pairs = σ bonds + π bonds + lone pairs at valence shells
Total electron pairs are determined by dividing the number total valence electrons by two. For, N2 molecule, Total pairs of electrons are five in their valence shells.
Because, there are only two atoms and both atoms belongs to same element, do not need to worry about center atom selection.
After determining the center atom and sketch of N2 molecule, we can start to mark lone pairs on atoms. Remember that, there are total of five electron pairs.
There are charges on both nitrogen atoms. One nitrogen atom has +2 charge and other nitrogen atom has -2 charge.
Because, there are charges on both nitrogen atoms and those charges are large, above structure is not stable. Therefore, we need to reduce charges as below by converting lone pairs to bonds.
In the last structure, you see there are no charges on nitrogen atoms and valence shell has eight electrons to fulfill the octal in both nitrogen atoms.
Questions
In the lewis structure of nitrogen molecule, each nitrogen atom in N2 molecule has one lone pair in their valence shell (outer shell).
There is a triple bond in lewis structure of N2 molecule.