Multiple ChoiceWhich element is considered the first in the series commonly referred to as the rare earth metals (lanthanides)?2views
Multiple ChoiceWhich major element is a primary component of human bones (mainly as calcium phosphate in hydroxyapatite)?2views
Multiple ChoiceWhich element is commonly used in white paint pigments because it forms a bright, opaque compound that is chemically stable?1views
Multiple ChoicePeriodic Table: Classifications — Which element is commonly used to make white paint because it forms the white pigment titanium dioxide (TiO2)?2views