<span>The region(s) of the periodic table which are
made up of elements that can adopt both positive and negative oxidation numbers
are the “non-metal” region. As we can see on the periodic table, the elements situated
at the right side of the table have two oxidation states, one positive and the
other a negative. </span>
You would expect Na to have the larger ionic radius
This is because a helium atom is loath to give up its two electrons, which perfectly fill its only electron shell. ... Elements with shells that are already full and have no electrons to lend are called noble gases—and helium, the smallest of these, is considered the most inert.20 Mar 2018