Question

Which of the following is a characterstic of d-block elements?

• A. They are all non-metals.
• B. They can only loose electrons.
• C. They have d-sub shell as their outermost orbit.
• D. They have s-sub shell as their outermost orbit.

Answer 1

The correct option is D They have s-sub shell as their outermost orbit.

Electrons fill into shells, subshells, and orbitals according to provision for the lowest energy arrangement or ground state electron configuration of an atom. The electrons in one subshell have exactly the same level of energy, with later subshells having more energy per electron than earlier ones.
Although they are d-block elements yet they have s-orbitals not d-orbitals as their outermost orbit due to the lower energy of 4s orbitals than the 3d.