Atomic Structure - Result Question 70
46. Which of the following statement (s) is (are) correct ?
(1998, 2M)
(a) The electronic configuration of $Cr$ is $[Ar] 3 d^{5} 4 s^{1}$ (atomic number of $Cr=24$ )
(b) The magnetic quantum number may have a negative value
(c) In silver atom, $23$ electrons have a spin of one type and $24$ of the opposite type. (atomic number of $Ag=47$ )
(d) The oxidation state of nitrogen in $HN _3$ is $-3$
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Answer:
Correct Answer: 46. (a, b, c)
Solution:
- (a) $Cr=[Ar] 3 d^{5} 4 s^{1}$, an exception to aufbau principle.
(b) For a given value of $l, m$ can have any value from $(-l$ to $+l)$, so can have negative value.
(c) Ag is in copper group with $d^{10} s^{1}$ configuration, i.e. $46$ electrons are spin paired.
BETA
