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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The following are isoelectronic species: Cl, K+, and Ca2+. Rank them in order of increasing (a) size, (b) ionization energy, and (c) electron attachment enthalpy.

a)

Interpretation Introduction

Interpretation:

For the given ions increasing order of ionic radius has to be ranked.

Concept Introduction:

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

Atomic radius: The concept explain chemical element is a measured of the size of its atoms, in other words to measure the distance from the center of the nucleus to the boundary of the surrounding cloud of number of electrons.

Increase and decrease electro negativity: The less vacancy electrons an atoms has the least it will gain of electrons. Moreover the electron affinity decrease down the groups and from right to left across the periods on the periodic table, the reason is electrons are placed in a higher energy level far from the nucleus thus a decrease from its pull.

Electron attachment enthalpy: ΔEAH is defined as the enthalpy change occurring when a gaseous atom adds an electron forming a gaseous anion.

  A(g)+e-A-(g)----ElectronattachmententhalpyEAH

Electron affinity: The atoms are closely related to ΔEAH. The (EA) is equal in magnitude but opposite is sign to the internal energy change associated with a gas atom adding an electron.

  A(g)+e-A-(g)----ElectronaffinityEA=-ΔU       

Explanation

The atomic radii increase down the group and increases along the period. Here, on adding the electron into the same sub-shell decreases the effective nuclear attraction with the electrons; the size increases.  While removing electrons effective nuclear attraction with the valence electrons increases and makes the ion shrinks. The atomic radii images are shown below

  

b)

Interpretation Introduction

Interpretation:

The element has to be ranked in increasing ionization energy.

Concept Introduction:

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

Atomic radius: The concept explain chemical element is a measured of the size of its atoms, in other words to measure the distance from the center of the nucleus to the boundary of the surrounding cloud of number of electrons.

Increase and decrease electro negativity: The less vacancy electrons an atoms has the least it will gain of electrons. Moreover the electron affinity decrease down the groups and from right to left across the periods on the periodic table, the reason is electrons are placed in a higher energy level far from the nucleus thus a decrease from its pull.

Electron attachment enthalpy: ΔEAH is defined as the enthalpy change occurring when a gaseous atom adds an electron forming a gaseous anion.

  A(g)+e-A-(g)----ElectronattachmententhalpyEAH

Electron affinity: The atoms is closely related to ΔEAH. The (EA) is equal in magnitude but opposite is sign to the internal energy change associated with a gas atom adding an electron.

  A(g)+e-A-(g)----ElectronaffinityEA=-ΔU       

c)

Interpretation Introduction

Interpretation:

The element has to be ranked in increasing electron attachment enthalpy.

Concept Introduction:

Atomic radius: The concept explain chemical element is a measured of the size of its atoms, in other words to measure the distance from the center of the nucleus to the boundary of the surrounding cloud of number of electrons.

Increase and decrease electro negativity: The less vacancy electrons an atoms has the least it will gain of electrons. Moreover the electron affinity decrease down the groups and from right to left across the periods on the periodic table, the reason is electrons are placed in a higher energy level far from the nucleus thus a decrease from its pull.

Electron attachment enthalpy: ΔEAH is defined as the enthalpy change occurring when a gaseous atom adds an electron forming a gaseous anion.

  A(g)+e-A-(g)----ElectronattachmententhalpyEAH

Electron affinity: The atoms are closely related to ΔEAH. The (EA) is equal in magnitude but opposite is sign to the internal energy change associated with a gas atom adding an electron.

  A(g)+e-A-(g)----ElectronaffinityEA=-ΔU       

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