<ol>
<li><p>A - shielding effect is caused by electrons in lower energy levels “shielding” the electrons at the outer most level (valance electrons). Since Fr has most energy levels among the choices, it has the highest shielding effect. this makes its atomic radius relatively large as well.</p></li>
<li><p>E, i think. this one is just about terminology. the 5d subshell can hold 10 e-'s, but each orbital can hold only two, spin up and spin down.</p></li>
<li><p>i dunno but it might be A because the “small attractions” might be the forces that account for orbital shapes.</p></li>
<li><p>period. 2nd energy level is just anything that ends with 2p</p></li>
</ol>
<p>hope these are right and hope it helps.</p>