Scandium Watch

IgorYakov
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#1
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In my AQA textbook (Nelson Thornes) and revision guides it says Sc is not a transition metal yet when I look online and in online revision notes it says it is, was the definition of transition metals changed recently?
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Zarah01
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(Original post by IgorYakov)
In my AQA textbook (Nelson Thornes) and revision guides it says Sc is not a transition metal yet when I look online and in online revision notes it says it is, was the definition of transition metals changed recently?
It's not a 'true' transition metal; transition metals are metals that can form ions with partially filled d subshells, scandium and zinc can't do this, so technically they aren't transition metals but they are part of the 3d block and generally all of the d block are labelled as transition metals.
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LadyEcliptic
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Transition metals have a partially filled d sub shell and form at least 1 ion with a incomplete d subshell (with copper and chromium being weird due to their structure for stability)

Scandium and Zinc do not do this but they are transition metals in a sense... But for your exam, Sc and Zn are he exceptions that they may ask you about,
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IgorYakov
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(Original post by LadyEcliptic)
Transition metals have a partially filled d sub shell and form at least 1 ion with a incomplete d subshell (with copper and chromium being weird due to their structure for stability)

Scandium and Zinc do not do this but they are transition metals in a sense... But for your exam, Sc and Zn are he exceptions that they may ask you about,
Ohh okay because on the specification it says partially filled d sub shell in atoms or ions so doesn't Sc fit that definition? Or should I still assume it isn't for the exam?
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LadyEcliptic
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(Original post by IgorYakov)
Ohh okay because on the specification it says partially filled d sub shell in atoms or ions so doesn't Sc fit that definition? Or should I still assume it isn't for the exam?
If your exam board says it's not, then you learn it that way - it's also worth remembering that transition metals form coloured complexes as aqueous solutions, I don't think Sc and Zn do. But yes, as far as I've been taught they don't form at least one ion with a partially filled d sub shell, and in their element form they don't have an incomplete d sub shell (with Cr and Cu an exception due to the half filled and filled d sub shell conferring stability)
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Pigster
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(Original post by IgorYakov)
Ohh okay because on the specification it says partially filled d sub shell in atoms or ions so doesn't Sc fit that definition? Or should I still assume it isn't for the exam?
You're slightly mis-understanding what the spec. says:

know that transition metal characteristics of elements Ti – Cu arise from an incomplete d sub-level in atoms or ions

That doesn't define what one is. I haven't taught AQA for six years, but when I did, the definition was one that had an ion with an incomplete d sub-shell.
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