Question

decide whether these proposed lewis structures are reasonable. proposed lewis structure is the proposed lewis structure reasonable? 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: 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: 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: Calculate valence - electrons for CO

Carbon has 4 valence electrons and oxygen has 6 valence electrons. So the total number of valence electrons for CO is $4 + 6=10$. In the given Lewis structure of CO, there are 10 valence electrons (4 non - bonding electrons and 6 bonding electrons in the double - bond). Also, both C and O satisfy the octet rule.

Step2: Calculate valence - electrons for $N_3^-$

Nitrogen has 5 valence electrons. For $N_3^-$, the total number of valence electrons is $3\times5 + 1=16$ (the extra 1 is due to the negative charge). In the given Lewis structure of $N_3^-$, there are 16 valence electrons (10 non - bonding electrons and 6 bonding electrons). And all nitrogen atoms satisfy the octet rule.

Step3: Calculate valence - electrons for $CO_2$

Carbon has 4 valence electrons and each oxygen has 6 valence electrons. So the total number of valence electrons for $CO_2$ is $4+2\times6 = 16$. In the given Lewis structure of $CO_2$, there are 16 valence electrons (8 non - bonding electrons and 8 bonding electrons). And both C and O satisfy the octet rule.

Answer:

1. Yes.
2. Yes.
3. Yes.