Phosphate Lewis structure?

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Rebecca Chu 1C
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Joined: Fri Apr 06, 2018 11:02 am

Phosphate Lewis structure?

Postby Rebecca Chu 1C » Sun Jun 03, 2018 3:04 pm

This is a question from test 3. What would the correct lewis structure for a phosphate molecule be?

Brynne Keyser 1B
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

Re: Phosphate Lewis structure?

Postby Brynne Keyser 1B » Sun Jun 03, 2018 3:13 pm

The molecular formula for phosphate is [PO4]3-, so phosphorus will be the central atom, with all of the oxygens connected to it. One of the oxygens will form a double bond with the phosphorus, adding resonance to the structure. All of the oxygens have their octets satisfied.

Rebecca Chu 1C
Posts: 27
Joined: Fri Apr 06, 2018 11:02 am

Re: Phosphate Lewis structure?

Postby Rebecca Chu 1C » Sun Jun 03, 2018 3:26 pm

Why doesn't the central atom follow the octet rule though?

Chem_Mod
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Re: Phosphate Lewis structure?

Postby Chem_Mod » Sun Jun 03, 2018 11:18 pm

expanded octet. P is 3rd row of periodic table.

Amanda 1A
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Joined: Fri Apr 06, 2018 11:01 am

Re: Phosphate Lewis structure?

Postby Amanda 1A » Sun Jun 03, 2018 11:20 pm

the atoms in the 3rd row and below on the periodic table can break the octet rule since they have additional orbitals.


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