Assertion: actinium | /r/HasProperty | third element
Facets:
Source sentences:
text: It is the third element in row 7 of the periodic table.
text: Actinium is the third element in Row 7 of the periodic table, a chart that shows how the chemical elements are related to each other.
text: Actinium is the third element in Row 7 of the periodic table, a chart that shows how the chemical elements are related to each other.
text: Actinium is the third element in Row 7 of the periodic table.