Chapter 5, Problem 84A

Interpretation Introduction

Interpretation:

The Aufbau’s sequence of orbital from $1s$ to $\text{7p}$ needs to be represented.

Concept introduction:

The Aufbau Principle states that during writing the electron configuration for an atom, orbitals are filled in order of increasing energy level.

Answer to Problem 84A

Sequence of orbitals from $1s$ to $\text{7p}$ will be:

$1s,2s,2p,3s,3p,4s,3d,4p,5s,4d,5p,6s,4f,5d,6p,7s,5f,6d,7p\mathrm{.........}$

Explanation of Solution

Aufbau Principle  states that in the ground state electrons of an atom fill the orbital with lowest energy first and upcoming electrons are filled in the order of increasing their energies.

The order in which the orbitals are filled with electrons is:

$1s,2s,2p,3s,3p,4s,3d,4p,5s,4d,5p,6s,4f,5d,6p,7s,5f,6d,7p\mathrm{.........}$.