Question

The atomic number of elements of first transition series lie in the range of:
A. 19 to 28
B. 20 to 29
C. 21 to 30
D. 22 to 31

Answer 1

We must know about what actually transition series and metals are to solve this question, Transition series are the set or collection of transition metals. THey are also called as f-block elements.

Complete step by step solution: All in all, any element which relates to the d-block of the modern periodic table (which comprises groups 3-12) is viewed as a transition element. Indeed, even the f-block elements including the lanthanides and the actinides can be considered as transition metals.
The elements of the first transition series are those for which the $3d$ electron shell contains somewhere in the range of one and nine electrons. Copper is involved due to fact that, its outer electronic configuration is $3{{d}^{10}}4{{s}^{1}}$, it has the $3{{d}^{9}}$ configuration in its usually occurring $+2$oxidation state. Zinc isn't regularly considered a transition element since in both the elements and its compounds the electron shell stays filled. It hence doesn't show the properties of colored compounds and paramagnetism appeared by different elements in any one of their oxidation states.
First transition series, that is $3d$ series is from scandium to zinc. Atomic numbers are from 21 to 30.

Transition elements	Atomic Number	Electronic configuration
$Sc$	$21$	$\left[ Ar \right]3{{d}^{1}}4{{s}^{2}}$
$Ti$	$22$	$\left[ Ar \right]3{{d}^{2}}4{{s}^{2}}$
$V$	$23$	$\left[ Ar \right]3{{d}^{3}}4{{s}^{2}}$
$Cr$	$24$	$\left[ Ar \right]3{{d}^{5}}4{{s}^{1}}$
$Mn$	$25$	$\left[ Ar \right]3{{d}^{5}}4{{s}^{2}}$
$Fe$	$26$	$\left[ Ar \right]3{{d}^{6}}4{{s}^{2}}$
$Co$	$27$	$\left[ Ar \right]3{{d}^{7}}4{{s}^{2}}$
$Ni$	$28$	$\left[ Ar \right]3{{d}^{8}}4{{s}^{2}}$
$Cu$	$29$	$\left[ Ar \right]3{{d}^{10}}4{{s}^{1}}$
$Zn$	$30$	$\left[ Ar \right]3{{d}^{10}}4{{s}^{2}}$

Hence, the correct option is C.

Note: It is important to note that Scandium is incorporated by the definition, however so far just the $+3$ oxidation state has been established with certainty. Its compounds are accordingly diamagnetic with no color from $d-d$ transition, and its chemistry in this manner takes after that of aluminum as opposed to that of the other transition elements.