แม่แบบ:Infobox element/period-8-elements/overview/check

|- | style="text-align:center;" | ① | style="" | E ()

| style="border-right: 2px solid grey; " | theor.

| style="no=" | R

| style="" | [[:]] R,
cat:E (0)

| style="border-right: 2px solid grey; " | {{IB E R}}

| style="" | Isotopes of R,
cat:Isotopes E (0)

| style="border-right: 2px solid grey; " | {{แม่แบบ:Infobox isotopes}} R

| [ unk] |