CAIE A-Level Chemistry 28.1.1 Defining a Transition Element

Practise applying the definition of a transition element to electronic configurations of its stable ions.

Exam points

state that a transition element is a d-block element forming at least one stable ion with an incomplete d subshell
write the ion’s electronic configuration after removing 4s electrons before 3d electrons
use the stable ion, not the neutral atom alone, to decide whether the definition is satisfied

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Titanium is a transition element in Period 4. It is commonly found as $\mathrm{TiO}_{2}$ in minerals.

Define transition element.

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