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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 outer most shells.
(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 outer most shells.
(a) : Atomic number - 3 (2, 1); : Atomic number - 11 (2, 8, 1); : Atomic number - 19 (2, 8, 8, 1).
(b) : Atomic number - 4 (2, 2); : Atomic number - 20 (2, 8, 8, 2).
(b) : Atomic number - 4 (2, 2); : Atomic number - 20 (2, 8, 8, 2).
(c) : Atomic number - 2 (2); : Atomic number - 10 (2, 8); : Atomic number - 18 (2, 8, 8).
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