Q27 / 160 · TS EAMCET 2004 · Chemistry

Which of the following elements has least number of electrons in its $M$ shell ?

Correct answer
A
$K$
B
$Mn$
C
$Ni$
D
$Sc$

Solution

$$ { }_{19} \mathrm{~K}=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6, 4 s^1 $$ Number of electrons in $M$ shell $(n=3)=8$.

Hence, the correct answer is option: 'A'.

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