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Name:
(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.


Answer :

(a) Lithium : (2, 1)
Sodium :(2, 8, 1)

Potassium : (2, 8, 8, 1)

(b) Beryllium :(2, 2)
Calcium : (2, 8, 8, 2)


(c) Helium :(2); Neon :(2, 8)
Argon : (2, 8, 8)

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