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Chemistry 9 Online
OpenStudy (anonymous):

Which element has two valence electrons? lithium (Li) argon (Ar) calcium (Ca) fluorine (F) Which element has 7 valence electrons? nitrogen (N) neon (Ne) lithium (Li) chlorine (Cl)

OpenStudy (laurenmyers1098):

Calcium (Ca) has 2 valence electrons. Chlorine (Cl) has 7 valence electrons. The group number tells you how many they have. Calcium is in Group 2A so it has 2. Chlorine is in Group 7A so it has 7.

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