question_answer

The quantum number of the last electron of an element are given below. Predict the atomic number and name of the element from the following quantum numbers \[n=3,l=2,m=0,s=-\frac{1}{2}\]

A) 23, V                 

B) 21, Sc                 

C) 29, Cu                   

D) 28, Ni

Correct Answer: D

Solution :

[d]

\[n=3\]	\[l=2,\]		\[3d\]
\[m=-2\]	\[-1\]	\[0\]	\[+1\]	\[+2\]
\[{{d}_{{{x}^{2}}-{{y}^{2}}}}\]	\[{{d}_{xy}}\]	\[{{d}_{{{z}^{2}}}}\]	\[{{d}_{zx}}\]	\[{{d}_{xy}}\]
or	or	or	or	or
\[{{d}_{xy}}\]	\[{{d}_{zx}}\]	\[{{d}_{{{z}^{2}}}}\]	\[{{d}_{yz}}\]	\[{{d}_{{{x}^{2}}-{{y}^{2}}}}\]
					\[s=+\frac{1}{2}\]
					\[s=-\frac{1}{2}\]

                                                 Structure is \[3{{d}^{8}}\]   Atomic number = 28 The element is\[Ni\].