Identify the group of elements that corresponds to the following generalized electron configuration: [noble gas]ns 2 (n−1)d 2

For the answer to the question above, I think you are referring to the group of four elements. The Titanium, Zirconium, Hafnium and lastly the Rutherfordium are the group of elements that corresponds to the configuration you are asking.
I hope my answer helped you

Cause its being chemically applied?

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom.