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Page 1: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

CHAPTER 5

Page 2: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

When the Elements Were DiscoveredWhen the Elements Were Discovered

Page 3: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

ns1

ns2

ns2

np1

ns2

np2

ns2

np3

ns2

np4

ns2

np5

ns2

np6

d1

d5 d10

4f

5f

Ground State Electron Configurations of the ElementsGround State Electron Configurations of the Elements

Page 4: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

The Modern Periodic TableThe Modern Periodic Table

Period

Group

Alkali M

etal

Noble G

as

Halogen

Alkali E

arth Metal

Page 5: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Classification of the Elements

Page 6: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Electron Configurations of Cations and AnionsElectron Configurations of Cations and Anions

Na: [Ne]3s1 Na+ [Ne]

Ca: [Ar]4s2 Ca2+ [Ar]

Al: [Ne]3s23p1 Al3+ [Ne]

Atoms lose electrons so that cation has a noble-gas outer electron configuration.

H: 1s1 H- 1s2 or [He]

F: 1s22s22p5 F- 1s22s22p6 or [Ne]

O: 1s22s22p4 O2- 1s22s22p6 or [Ne]

N: 1s22s22p3 N3- 1s22s22p6 or [Ne]

Atoms gain electrons so that anion has a noble-gas outer electron configuration.

Of Representative ElementsOf Representative Elements

Page 7: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

+1

+2

+3 -1-2-3

Cations and Anions Of Representative ElementsCations and Anions Of Representative Elements

Page 8: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Na+: [Ne] Al3+: [Ne] F-: 1s22s22p6 or [Ne]

O2-: 1s22s22p6 or [Ne] N3-: 1s22s22p6 or [Ne]

Na+, Al3+, F-, O2-, and N3- are all isoelectronic with Ne

What neutral atom is isoelectronic with H- ?

H- : 1s2 same electron configuration as He

Isoelectronic: have the same number of electrons, and hence the same ground-state electron configuration

Page 9: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Electron Configurations of Cations of Electron Configurations of Cations of Transition MetalsTransition Metals

When a cation is formed from an atom of a transition metal, electrons are always removed first from the ns orbital and then from the (n – 1)d orbitals.

Fe: [Ar]4s23d6

Fe2+: [Ar]4s03d6 or [Ar]3d6

Fe3+: [Ar]4s03d5 or [Ar]3d5

Mn: [Ar]4s23d5

Mn2+: [Ar]4s03d5 or [Ar]3d5

Page 10: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Effective nuclear charge (Zeff) is the “positive charge” felt by an electron.

Na

Mg

Al

Si

11

12

13

14

10

10

10

10

1

2

3

4

186

160

143

132

ZeffCoreZ Radius (pm)

Zeff = Z - 0 < < Z ( = shielding constant)

Zeff Z – number of inner or core electrons

Page 11: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Effective Nuclear Charge (Effective Nuclear Charge (ZZeffeff))

increasing Zeff

incr

easi

ng

Ze

ff

Page 12: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Atomic RadiiAtomic Radii

metallic radius

covalent radius

Page 13: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State
Page 14: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Decreasing atomic radius

incr

easi

ng

ato

mic

rad

ius

Page 15: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Trends in Atomic RadiiTrends in Atomic Radii

Page 16: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Comparison of Atomic Radii with Ionic RadiiComparison of Atomic Radii with Ionic Radii

Page 17: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

• Cation is always smaller than atom from which it is formed.

• Anion is always larger than atom from which it is formed.

Page 18: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

The Radii (in pm) of Ions of Familiar ElementsThe Radii (in pm) of Ions of Familiar Elements

Page 19: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State
Page 20: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State
Page 21: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Ionization energy is the minimum energy (kJ/mol) required to remove an electron from a gaseous atom in its ground state.

I1 + X (g) X+

(g) + e-

I2 + X+(g) X2+

(g) + e-

I3 + X2+(g) X3+

(g) + e-

I1 first ionization energy

I2 second ionization energy

I3 third ionization energy

I1 < I2 < I3

Page 22: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State
Page 23: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Filled n=1 shell

Filled n=2 shell

Filled n=3 shell

Filled n=4 shellFilled n=5 shell

Variation of the First Ionization Energy with Atomic NumberVariation of the First Ionization Energy with Atomic Number

Page 24: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

General Trends in First Ionization EnergiesGeneral Trends in First Ionization Energies

Increasing First Ionization Energy

Incr

ea

sin

g F

irs

t Io

niz

ati

on

En

erg

y

Page 25: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State
Page 26: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Electron affinity is the negative of the energy change that occurs when an electron is accepted by an atom in the gaseous state to form an anion.

X (g) + e- X-(g)

F (g) + e- X-(g)

O (g) + e- O-(g)

H = -328 kJ/mol EA = +328 kJ/mol

H = -141 kJ/mol EA = +141 kJ/mol

Page 27: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State
Page 28: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Variation of Electron Affinity With Atomic Number (H – Ba)Variation of Electron Affinity With Atomic Number (H – Ba)

Page 29: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

General Trends in Electron AffinityGeneral Trends in Electron Affinity

Electron affinity increase

Ele

ctr

on

aff

init

y d

ecr

eas

e

Page 30: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Electronegatively Electronegatively

electronegativity increase

ele

ctr

on

ega

tivi

ty d

ec

reas

e

The ability of an atom to attract electrons (or electron density) towards itself in a covalent bond.

Page 31: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 1A Elements (nsGroup 1A Elements (ns11, n , n 2) 2)

M M+1 + 1e-

2M(s) + 2H2O(l) 2MOH(aq) + H2(g)

4M(s) + O2(g) 2M2O(s)

Incr

ea

sing

re

activ

ity

Page 32: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 1A Elements (nsGroup 1A Elements (ns11, n , n 2) 2)

Page 33: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 2A Elements (nsGroup 2A Elements (ns22, n , n 2) 2)

M M+2 + 2e-

Be(s) + 2H2O(l) No Reaction

Incr

easi

ng r

eact

ivity

Mg(s) + 2H2O(g) Mg(OH)2(aq) + H2(g)

M(s) + 2H2O(l) M(OH)2(aq) + H2(g) M = Ca, Sr, or Ba

Page 34: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 2A Elements (nsGroup 2A Elements (ns22, n , n 2) 2)

Page 35: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 3A Elements (nsGroup 3A Elements (ns22npnp11, n , n 2) 2)

4Al(s) + 3O2(g) 2Al2O3(s)

2Al(s) + 6H+(aq) 2Al3+

(aq) + 3H2(g)

Page 36: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 3A Elements (nsGroup 3A Elements (ns22npnp11, n , n 2) 2)

Page 37: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 4A Elements (nsGroup 4A Elements (ns22npnp22, n , n 2) 2)

Sn(s) + 2H+(aq) Sn2+

(aq) + H2 (g)

Pb(s) + 2H+(aq) Pb2+

(aq) + H2 (g)

Page 38: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 4A Elements (nsGroup 4A Elements (ns22npnp22, n , n 2) 2)

Page 39: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 5A Elements (nsGroup 5A Elements (ns22npnp33, n , n 2) 2)

N2O5(s) + H2O(l) 2HNO3(aq)

P4O10(s) + 6H2O(l) 4H3PO4(aq)

Page 40: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 5A Elements (nsGroup 5A Elements (ns22npnp33, n , n 2) 2)

Page 41: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 6A Elements (nsGroup 6A Elements (ns22npnp44, n , n 2) 2)

SO3(g) + H2O(l) H2SO4(aq)

Page 42: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 6A Elements (nsGroup 6A Elements (ns22npnp44, n , n 2) 2)

Page 43: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 7A Elements (nsGroup 7A Elements (ns22npnp55, n , n 2) 2)

X + 1e- X-1

X2(g) + H2(g) 2HX(g)

Incr

easi

ng r

eact

ivity

Page 44: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 7A Elements (nsGroup 7A Elements (ns22npnp55, n , n 2) 2)

Page 45: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Group 8A Elements (nsGroup 8A Elements (ns22npnp66, n , n 2) 2)

Completely filled ns and np subshells.Highest ionization energy of all elements.No tendency to accept extra electrons.

Page 46: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

Compounds of the Noble GasesCompounds of the Noble Gases

A number of xenon compounds XeF4, XeO3, XeO4, XeOF4 exist.A few krypton compounds (KrF2, for example) have been prepared.

Page 47: CHAPTER 5. When the Elements Were Discovered ns 1 ns 2 ns 2 np 1 ns 2 np 2 ns 2 np 3 ns 2 np 4 ns 2 np 5 ns 2 np 6 d1d1 d5d5 d 10 4f 5f Ground State

The metals in these two groups have similar outer electron configurations, with one electron in the outermost s orbital.Chemical properties are quite different due to difference in the ionization energy.

Comparison of Group 1A and 1BComparison of Group 1A and 1B

Lower I1, more reactive


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