Question

decide whether these proposed lewis structures are reasonable.
proposed lewis structure is the proposed lewis structure reasonable?
:o - c - o:
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:*
h = br
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:* h
:o:
||
h - c - h
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 CO₂

Carbon has 4 valence electrons and each oxygen has 6 valence electrons. So for CO₂ ($CO_2$), the total number of valence electrons is $4 + 2\times6=16$. The given structure has 14 valence electrons.

Step2: Analyze H - Br structure

Hydrogen has 1 valence electron and bromine has 7 valence electrons, giving a total of 8 valence electrons which is correct. But hydrogen can only have a maximum of 2 electrons (duet rule), and the structure shows a double - bond which violates the duet rule for hydrogen.

Step3: Calculate valence - electrons for formaldehyde ($H_2CO$)

Carbon has 4 valence electrons, each hydrogen has 1 valence electron, and oxygen has 6 valence electrons. So for $H_2CO$, the total number of valence electrons is $2\times1 + 4+6 = 12$. The given structure has 10 valence electrons.

Answer:

1. No, it has the wrong number of valence electrons. The correct number is: 16
2. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: H
3. No, it has the wrong number of valence electrons. The correct number is: 8