Which element has (a) two shells, both...

Which element has
(a) two shells, both of which are completely filled with electrons ?
(b) the electronic congiguration 2, 8, 2 ?
(c) a total of three shells, with four electrons in its valence shell ?
(d) a total of two shells, with three electrons in its valence shell ?
(e) twice as many electrons in its seconds shell as in its first shell ?

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