1.

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

Answer»

(a) Lithium, Sodium, Potassium .

(b) Magnesium, Calcium .

(c) Helium, Neon, Argon .



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