Among the elements from atomic number 1 to 36, the number of elements which have an unpaired electron in their s subshell is

Question

Among the elements from atomic number 1 to 36, the number of elements which have an unpaired electron in their s subshell is (A) 7 (B) 9 (C) 4 (D) 6

Tardigrade Admin · Accepted Answer

Among the elements from atomic number to 36, following six elements have an unpaired electron in their s-subshell.

_{1} H = 1 s^{1}

_{3} L i = 1 s^{2}, 2 s^{1}

_{11} N a = 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{1}

_{19} K = 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{1}

_{24} C r = 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{1}, 3 d^{5}

_{29} C u = 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{1}, 3 d^{10}

Q. Among the elements from atomic number 1 to 36, the number of elements which have an unpaired electron in their s subshell is