Question

question 17
what is the formal charge on the central atom in the given lewis structure for cobr₂?
0
+2
-2
+1
question 18
select the answer that correctly ranks the elements by increasing electronegativity.
na < si < n < o
n < na < si < o
na < n < si < o
o < n < si < na

Explanation:

Step1: Valence electrons of C

Carbon has 4 valence electrons.

Step2: Lone pair electrons on C

Central C has 0 lone pair electrons.

Step3: Bonding electrons around C

Double bond (4e⁻) + 2 single bonds (2e⁻ each) = 8e⁻. 1/2 bonding e⁻ = 4.

Step4: Formal charge calculation

Formal charge = 4 - (0 + 4) = 0.

Answer:

0
A. Na < Si < N < O