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 $H_3O^+$

Hydrogen has 1 valence electron and oxygen has 6 valence electrons. For $H_3O^+$, the total number of valence electrons is $3\times1 + 6-1=8$ (subtract 1 for the positive charge). The given Lewis - structure of $H_3O^+$ has the correct number of valence electrons and satisfies the octet rule for oxygen and duet rule for hydrogen. So the answer for the first one is "Yes".

Step2: Calculate valence - electrons for $N_2$

Nitrogen has 5 valence electrons. For $N_2$, the total number of valence electrons is $2\times5 = 10$. The given Lewis - structure has 12 electrons (6 lone - pair electrons and 6 bonding electrons), so it has the wrong number of valence electrons. The correct number is 10.

Step3: Calculate valence - electrons for $H_2O$

Hydrogen has 1 valence electron and oxygen has 6 valence electrons. For $H_2O$, the total number of valence electrons is $2\times1+6 = 8$. The given Lewis - structure has the right number of valence electrons. But the central oxygen atom has 10 electrons (6 lone - pair electrons and 4 bonding electrons), which violates the octet rule. The problem atom is O.

Answer:

1. Yes.
2. No, it has the wrong number of valence electrons. The correct number is: 10
3. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: O