নিচে মৌলগুলির পরমাণু ইলেকট্রন বিন্যাস দেয়া হল। মৌলগুলোর সংকেত লিখ।

$\left(\mathrm{i}\right)1s^{2}2s^{2}2p^{6}3s^{2}3p^{10}4s^{2}4p^{6}5s^1\to$

$\left(\mathrm{ii}\right)1s^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}4{\mathrm{p}}^{6}4{\mathrm{d}}^{10}5s^1\to$

$\left(\mathrm{iii}\right)1s^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}3{\mathrm{p}}^5\to$

$\left(\mathrm{iv}\right)1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}4{\mathrm{p}}^{6}4{\mathrm{d}}^{10}5{\mathrm{s}}^{2}5{\mathrm{p}}^{6}6{\mathrm{s}}^1\to$

$\left(\mathrm{v}\right)1s^{2}2s^{2}2p^{6}2s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}4f^{14}5s^{2}5p^{6}5d^{10}6s^{2}6a^{6}7s^1\to$