(a) Name three elements that have a single electron in their outermost shells. (b) Name two elements that
(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.
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(a) Lithium, Sodium, Potassium .
(b) Magnesium, Calcium .
(c) Helium, Neon, Argon .
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