Assertion: calcium | /r/HasProperty | alkaline earth metals
Facets:
value: always
type: DEGREE
Source sentences:
text: Calcium, strontium, barium, and radium are always considered to be alkaline earth metals; the lighter beryllium and magnesium, also in group 2 of the periodic table, are often included as well.
text: It is an alkaline earth metal.
text: Calcium, strontium, barium, and radium are always considered to be alkaline earth metals; the lighter beryllium and magnesium, also in group 2 of the periodic table, are often included as well.