Which location the metals placed in periodic table ?
Thallium displays the +1 oxidation state that all the known alkali metals display , and thallium compounds with thallium in its +1 oxidation state closely resemble the corresponding potassium or silver compounds due to the similar ionic radii of the Tl + ( 164 pm ) , K + ( 152 pm ) and Ag + ( 129 pm ) ions .