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

To determine the correct range of atomic numbers for the elements in the first transition series, we first need to identify what the first transition series is.

The first transition series includes the transition metals that are found in the d-block of the periodic table and corresponds to the filling of the 3d subshell. The elements of the first transition series include:

Scandium (Sc) - Atomic number 21
Titanium (Ti) - Atomic number 22
Vanadium (V) - Atomic number 23
Chromium (Cr) - Atomic number 24
Manganese (Mn) - Atomic number 25
Iron (Fe) - Atomic number 26
Cobalt (Co) - Atomic number 27
Nickel (Ni) - Atomic number 28
Copper (Cu) - Atomic number 29
Zinc (Zn) - Atomic number 30
Now, let's examine the atomic numbers:

The atomic number of the first element (Sc) is 21.
The atomic number of the last element (Zn) is 30.
From this, we can see that the atomic numbers of elements in the first transition series range from 21 to 30.

Conclusion
Thus, the correct answer is C. 21 to 30.