<p>(i) The electronic configuration of Ce is:</p>

<p><span class="equation">\(_{58}Ce = [Xe]^{54}4f^15d^16s^2\)</span></p>

<p>Calculate the spin only magnetic moment of&nbsp;<span class="equation">\(Ce^{3+}\)</span>ion.</p>

<p>(ii) Why is copper regarded as a transition element although copper atom has completely filled d-orbitals its ground state?</p>

<p>(iii) Why is&nbsp;<span class="equation">\(Sc^{3+}\)</span>&nbsp;colourless in aqueous solution whereas <span class="equation">\(Ti^{3+}\)</span>&nbsp;is coloured?​​​​​​​</p>