<p>(i) Which is the most common oxidation state in Lanthanoids?</p>

<p>(ii) Why is there a gradual decrease in the atomic sizes of transition metals in a series with increasing atomic numbers?</p>

<p>(iii) Calculate the number of unpaired electrons in the following gaseous ions:</p>

<p><span class="equation">\(V^{3+}, Ti^{3+}\)</span>​​​​​​​</p>