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Q.

Identify the elements of lowest atomic numbers which have the characteristics listed as below
A. Eleven p electrons
B. one electron with m_l = 2
C. Two electrons with n=3,l = 2

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a

Cl,Ti,Sc

b

Cl,Sc,Ti

c

Cl,Ti,V

d

Cl, V, Cr

answer is B.

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Detailed Solution

$A - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} - Cl (17), 11 p$ electrons

$B - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{1}, (Sc - 21), l = 2 and m_{l} = 2 for 3 d -electron$

$C - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{2} (Ti - 22), n = 3 and l = 2$ $for 3 d^{2} electrons.$

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Identify the elements of lowest atomic numbers which have the characteristics listed as belowA. Eleven p electronsB. one electron with ml = 2C. Two electrons with n=3,l = 2