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Edexcel | Chemistry WCH0 | W 19 5 1 | 1 hour 45 minutes
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1 Mark

Chromium is classified as a transition element because

  A it is in the d block of the Periodic Table.

  B it forms stable ions in which it has different oxidation numbers.

  C it has incompletely filled d orbitals.

  D it forms stable ions which have incompletely filled d orbitals.

The only correct answer is D

A is not correct because not all d block metals are transition elements.

B is not correct because the definition should refer to incompletely filled d orbitals.

C is not correct because it must refer to ions, not just the atoms of the element.

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