Consider the hypothetical situation where the azimuthal quantum number, 1, takes values 0,1,2,….n+1, where n is the principal quantum number. Then, the element with atomic number

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13 has a half-filled valence subshell

6 has a 2p-valence subshell

8 is the first noble gas

9 is the first alkali metal

answer is A.

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Detailed Solution

${(1)}_{13} X = 1 s^{2} 1 p^{6} 1 d^{5} - h a l f f i l l e d {(2)}_{g} X = 1 s^{2} 1 p^{6} 1 d^{1} - n o t a l k a l m e t a l {(3)}_{g} X = 1 s^{2} 1 p^{6} - \sec o n d n o b e l g a s$

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