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A Transition Metal is an element from the D block of the periodic table which forms at least one ion with an incomplete d sub–shell containing at least one electron.

Used ambiguously by the WJEC to annoy students, especially Sam Jones.
Sam: 'Hey Alex, what's a transition metal?'

Alex: 'It's a D block element that forms ions with incomplete d orbitals.'

Sam 'Yeah, but the WJEC aren't really clear on their definition. It's causing a lot of confusion.'

Alex: 'That's exactly the type of shit those cunts would do!'
by GFawkes March 27, 2013
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