Assertion: metal's valence electron | /r/HasProperty | lost in chemical reactions
Facets:
value: to form a dipositive ion
type: PURPOSE
value: very easily
type: MANNER
Source sentences:
text: Like the other elements placed in group 2 of the periodic table, calcium has two valence electrons in the outermost s-orbital, which are very easily lost in chemical reactions to form a dipositive ion with the stable electron configuration of a noble gas, in this case argon.