Question

question 2 (1 point)
which of the following represents the correct electron - dot
cl
:cl:
:cl:
:cl:
:cl:
question 3 (1 point)
the correct name of the compound ncl₃ is
nitrogen chloride.
nitrogen(iii) chloride.
trinitrogen chloride
nitrogen trichloride.
nickel chloride.
question 4 (1 point)
what is the correct formula for iron (iii) sulfide?
fe₂s₂
fe₂s₃

Explanation:

Question 2

Chlorine (\(Cl\)) has 7 valence electrons. In the electron - dot (Lewis) structure, we represent the valence electrons as dots around the element symbol. The correct electron - dot structure for chlorine should have 7 dots. The structure \(:\ddot{Cl}:\) (assuming the third option with proper dot placement to represent 7 valence electrons) is correct as it shows the 7 valence electrons (2 pairs and 3 single dots around the \(Cl\) atom).

For binary covalent compounds (\(NCl_3\) is a covalent compound since it is between two non - metals \(N\) and \(Cl\)), we use prefixes to name them. The prefix “tri - ” is used for 3. The first element is named as the element (nitrogen) and the second element (chlorine) has its ending changed to “-ide” and the prefix “tri - ” is added because there are 3 \(Cl\) atoms.

Iron (III) has a charge of \(Fe^{3+}\) and sulfide has a charge of \(S^{2 - }\). To form a neutral compound, we use the criss - cross method. The magnitude of the charges cross over as subscripts. So for \(Fe^{3+}\) and \(S^{2 - }\), we get \(Fe_2S_3\) (\(3\times2 = 2\times3\) to balance the charges: \(2\times(+ 3)+3\times(-2)=0\)).

Answer:

The option with the correct electron - dot structure for chlorine (assuming it is the one with 7 dots represented properly as per Lewis structure rules)

Question 3