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Name the element with the following electronic configurations .
(a) `1s^(2)2s^(2) 2p^(6) 3s^(2) 3p^(1)`
(b) `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(1)`
(c ) `1s^(2) 2s^(1) 2p^(6) 3s^(2) 3p^(6) 3d^( 5) 4s^(1)`

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