   Chapter 7, Problem 5PS

Chapter
Section
Textbook Problem

Depict the electron configuration for each of the following atoms using spdf and noble gas notations.(a) Arsenic, As. A deficiency of As can impair growth in animals, and larger amounts are poisonous(b) Krypton, Kr. It ranks seventh in abundance of the gases in Earth's atmosphere

a)

Interpretation Introduction

Interpretation:

The Arsenic (As) electronic configurations has to be derived using its (s, p, d, f) notation and noble gas orbital box diagram.

Concept Introduction:

General properties of Arsenic (As): The arsenic occurs in many minerals and usually in combination with sulfur and metals but also as pure elemental crystal. Arsenic (As) is metalloid.

Electronic configuration: The electronic configuration is the distribution of electrons of an given molecule or respective atoms in atomic or molecular orbitals.

The important there rules for electronic configuration given below:

Aufbau principle: This rule statues that ground state of an atom or ions electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. If consider the 1s shell is filled the 2s subshell is occupied.

Hund's Rule: The every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

Pauli exclusion rule: an atomic orbital may describe at most two electrons, each with opposite spin direction.

Explanation
• Electron filling method of Arsenic (As):
1. 1. The spdf and orbital box notations, assign the 33 electrons for Arsenic (As) to orbitals based on the order of filling.
2. 2. The first 18 electrons are occupying 1s, 2s, 2p, 3s, 3p orbitals and remaining 15 electrons filling in 3d, 4s and 4p orbital shells.
3. 3. The noble gas notation: The first 18 electrons are identified by the symbol of the Ar it is a one of noble gas. The remaining (15) electrons are assigning to the 3d, 4s and 4p sub-shells. Hence the Hund’s rule is followed in the box notation.

AtomicnumberofArsenic(As)= 33Complete (spdf)notationof(As)=1s22s22p63s23p63d104s24p3Orbital filling method=1s22s22p63s23p6

b)

Interpretation Introduction

Interpretation:

The Krypton (Kr) electronic configurations has to be derived using its (s, p, d, f) notation and noble gas orbital box diagram.

Concept Introduction:

General properties of Arsenic (As): The arsenic occurs in many minerals and usually in combination with sulfur and metals but also as pure elemental crystal. In another important think (As) is metalloid, it is various allotropes and this metal only uses for industry.

Electronic configuration: The electronic configuration is the distribution of electrons of an given molecule or respective atoms in atomic or molecular orbitals.

The important there rules for electronic configuration given below:

Aufbau principle: This rule statues that ground state of an atom or ions electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. If consider the 1s shell is filled the 2s subshell is occupied.

Hund's Rule: The every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

Pauli exclusion rule: an atomic orbital may describe at most two electrons, each with opposite spin direction.

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