Chapter 7.9, Problem 1RC

Interpretation Introduction

Interpretation:

From the given ground state electronic configuration, the element has to be identified.

Concept introduction:

Aufbau Principle states that electrons starts to occupy from orbitals of lower energy level.  Thus, the obtained lower energy configuration is known as ground-state electron configuration.

Aufbau principle:

• Electrons first occupy orbitals with lower energy than higher energy.
• An orbital can be occupied only by two electrons having opposite spins.
• Greater the number of parallel spins of electrons more stable the orbital.  Each electron fills each orbital till it is half filled.  This is known as Hund’s rule.
• The order of electrons filling in an atom is given as

Figure 1