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Assume that HArF is a molecular compound. a. Draw its Lewis structure. b. What are the formal charges on $\mathrm{Ar}$ and $\mathrm{F}$ in the structure you drew? c. What is the shape of the molecule? d. Is HArF polar?

Sagot :

For each atom in a Lewis structure, you should count how many electrons it "owns" in order to get the formal charges. All of its lone pair electrons as well as 50% of its bonding electrons should be counted. The formal charge is the discrepancy between the atom's number of valence electrons and the number it possesses.

How do you determine a double bond's formal charge?

Formal Charge is calculated as follows: [# of valence electrons on a neutral atom] - [(# of lone electron pairs) + (12 # bonding electrons)] Valence electrons = match the periodic table's group number (for representative elements). Lone Pairs are atoms with only one electron present. An electron pair counts as two since each electron counts as one.

What does a formal charge of +1 indicate?

The Formal Charge is the difference between the Group Number and the number of assigned electrons if the number of assigned electrons is less than the Group Number (for example, if the assigned number of electrons is 4 and the atom is nitrogen with a Group Number of 5 (Group V), the Formal Charge would be +1, meaning it is positive).

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