Drop in ionisation energy in groups 2 and 3 Watch

ra1500
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Betwee n groups2 and 3 there is a slight decrease in ie due to the d and s block thing right? but does that not apply to the rest of the groups in s and d block? why are groups 2 and 3 the only exceptions when it comes to exceptions in the increasing ie trend acrros periods
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Kian Stevens
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What 'd and s block thing'?

The drops in energy between groups 2 and 3 are representative of electrons being in the p-subshell.
Take the drop in energy between Be and B for example: B's 2p1 electron is slightly more shielded than Be's 2s2 electron. This increase of shielding means that the electron is ionised with less energy, hence a drop in ionisation energy between groups 2 and 3.

d-subshells have nothing to do with the drops in energy, as shown by the fact that there are drops well before the d-subshell is in reach.
Last edited by Kian Stevens; 4 weeks ago
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TODTEMPLE01
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(Original post by ra1500)
Betwee n groups2 and 3 there is a slight decrease in ie due to the d and s block thing right? but does that not apply to the rest of the groups in s and d block? why are groups 2 and 3 the only exceptions when it comes to exceptions in the increasing ie trend acrros periods
In terms of between 2 and 3 I can only echo the post above. However, there is another group that is an exception, not just from 2-3 but also a decrease from 5-6 as the electrons are starting to pair up in their orbitals in G6 so they repel - making it easier for them to be removed
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Pigster
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(Original post by Kian Stevens)
B's 2p1 electron is slightly less shielded than Be's 2s2 electron.
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Kian Stevens
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(Original post by Pigster)
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Thanks for the correction, Mr. Pig
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Pigster
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(Original post by Kian Stevens)
What 'd and s block thing'?

This reduction of shielding means that the electron is ionised with less energy...
In that case, increase?
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Kian Stevens
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(Original post by Pigster)
In that case, increase?
Yep... Forgot about that one too.
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