7th edition 2B.7

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Henry Krasner 1C
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Joined: Fri Sep 28, 2018 12:15 am

7th edition 2B.7

Postby Henry Krasner 1C » Thu Nov 01, 2018 11:20 pm

What is the most effective strategy for solving problems like this, where you are tasked with going backwards per se and identifying a mystery element from a Lewis structure? How would one begin this process?

Rachana Jayaraman 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: 7th edition 2B.7

Postby Rachana Jayaraman 1H » Thu Nov 01, 2018 11:33 pm

For identifying a mystery element, first count the number of electrons in the molecule by adding the number of bonding electrons and the number of electrons in lone pairs. Then sum up the number of valence electrons for each given atom in its free state, like you would in the first step of writing the Lewis structure. Subtract the total electrons valence electrons from the total electrons for the molecule, and this will give you the valence electrons for the mystery element. This will give you the group that the element falls under, and there should be some given information about the period, which will then allow you to identify the element.

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