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07/10/2021 4:27 pm
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(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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07/10/2021 4:28 pm
(a) Lithium, Sodium, Potassium.
(b) Magnesium, Calcium.
(c) Helium, Neon, Argon.