Question

decide whether these proposed lewis structures are reasonable.
proposed lewis structure is the proposed lewis structure reasonable?
n = n
yes.
no, it has the wrong number of valence electrons.
the correct number is: 10
no, it has the right number of valence electrons but doesnt satisfy the octet rule.
the symbols of the problem atoms are: *
n - n
yes.
no, it has the wrong number of valence electrons.
the correct number is:
no, it has the right number of valence electrons but doesnt satisfy the octet rule.
the symbols of the problem atoms are: *
: n ≡ n :
yes.
no, it has the wrong number of valence electrons.
the correct number is:
no, it has the right number of valence electrons but doesnt satisfy the octet rule.
the symbols of the problem atoms are: *

• if two or more atoms of the same element dont satisfy the octet rule, just enter the chemical symbol as many times as necessary. for example, if two oxygen atoms dont satisfy the octet rule, enter \o,o\.

Explanation:

Step1: Determine valence electrons of N

Nitrogen is in group 15, so it has 5 valence electrons.

Step2: Calculate total valence electrons for $N_2$

For $N_2$, total valence electrons = 2×5 = 10.

Step3: Analyze first structure

The first structure $\ddot{N}=\ddot{N}$ has 12 valence - electrons (4 non - bonding and 8 bonding), so it has the wrong number of valence electrons.

Step4: Analyze second structure

The second structure $\ddot{N}-\ddot{N}$ has 14 valence - electrons (8 non - bonding and 6 bonding), so it has the wrong number of valence electrons.

Step5: Analyze third structure

The third structure :$N\equiv N$: has 10 valence - electrons (4 non - bonding and 6 bonding), and each N atom satisfies the octet rule, so it is a reasonable Lewis structure.

Answer:

1. No, it has the wrong number of valence electrons. The correct number is: 10
2. No, it has the wrong number of valence electrons. The correct number is: 10
3. Yes.