Chapter 6.9, Problem 2CP

Interpretation Introduction

Interpretation:

The element representing electronic configuration $\left[\text{Kr}\right]5s^{2}4d^{10}5p^5$ is to be identified.

Concept introduction:

The number of electrons in an element is equal to its atomic number. With the help of electrons in electronic configuration, the corresponding element can be deduced.

General rules for writing electronic configuration:

Electrons will reside in the available orbitals of lowest possible energy.

Each orbital can accommodate a maximum of two electrons.

Electrons will not pair in degenerate orbitals if an empty orbital is available.

Orbitals will fill in order of increasing energy $1s2s2p3s3p4s3d4p5s4d5p6s4f$.

s-orbital can have 0–2 electrons.

p-orbital can have 0–6 electrons.

d-orbital can have 0–10 electrons.

f-orbital can have 0–14 electrons.

In electronic configuration, noble gas symbol in brackets represents core electrons.