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(a) three elements that have a single electron in their outermost shells.
(b) two elements that have two electrons in their outermost shells.
(c) three elements with filled outermost shells


(a)Lithium(Li), Sodium(Na), Potassium(k)

(b)Magnecium(Mg), Calcium(Ca), Berium(Be)

(c)Neon(Ne), Argon(Ar), Xenon(Xe)

hoped helped u :))

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A. sodium
b. calcium 
c. argon
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