D-block was named by analogy with the spectroscopic notation of
atomic orbitals. D is from diffuse.
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They are all block elements. Ti is d block, Al is p block, Z is
d block and V is d block.
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The D-block
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The outermost electron of copper is situated in d block.
Therefor copper is a d block element.
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This is because the D-Block in the Periodic Table is where the
d-Subshell is being filled up. Chromium's d-Subshell is being
filled up and is therefore in the D-Block.