Homework Problem 2B.9(b)

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Doreen Liu 4D
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Homework Problem 2B.9(b)

Postby Doreen Liu 4D » Tue Oct 29, 2019 9:26 pm

When drawing the lewis structure of Potassium Phosphide, do we connect the K+ together or do we separate them around the P^3- structure?

Hiba Alnajjar_2C
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Joined: Fri Aug 09, 2019 12:17 am

Re: Homework Problem 2B.9(b)

Postby Hiba Alnajjar_2C » Tue Oct 29, 2019 9:39 pm

I believe that they should be separated around the phosphide structure, as this is an ionic compound. In contrast to covalent compounds, no electrons are being shared between the ions. Rather, electron(s) are being transferred, meaning you shouldn't draw a connection in your structure.

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Re: Homework Problem 2B.9(b)

Postby MMckinney_4H » Tue Oct 29, 2019 9:49 pm

Because it is an ionic compound, you would separate them, keeping the electrons by phosphorus. You go about arranging the lewis structure the same way but at the end you take the electrons from the bonds and give them to the phosphorus because it needs to end up with a charge of -3 as phosphorus does in ionic structures. This leaves each potassium with a charge of +1 which is typical of potassium.

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