Trying to find the right answer to this..

(a) 1s 2 2s 2 2p 6 3s 1 ; Atomic number of the element is 11. (b) 1s 2 2s 2 2p 3 ; Atomic number of the element is 7. (c) 1s 2 2s 2 2p 6 3s 2 3p 5 ; Atomic number of the element is 17.

Structure of Atom

Question

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What are the atomic numbers of elements whose outermost electrons are represented by
(a) 3s¹ (b) 2p³ and (c) 3p⁵?

Answer

(a) 1s²2s²2p⁶3s¹;
Atomic number of the element is 11.
(b) 1s²2s²2p³;
Atomic number of the element is 7.
(c) 1s²2s²2p⁶3s²3p⁵;
Atomic number of the element is 17.