Assertion: period's element | /r/AtLocation | single cell of the main table
Facets:
value: between hafnium
type: LOCATION
value: between barium
type: LOCATION
Source sentences:
text: In presentations of the periodic table, the lanthanides and the actinides are customarily shown as two additional rows below the main body of the table, with placeholders or else a selected single element of each series (either lanthanum or lutetium, and either actinium or lawrencium, respectively) shown in a single cell of the main table, between barium and hafnium, and radium and rutherfordium, respectively.