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Chapter 7 and 8
Ionic and Covalent Bonding
7.1 Ions

• Valence Electrons are the electrons in
the highest occupied energy level of an
element’s atoms.
• The number o...
Valence Electrons
• Valence electrons are usually the only
electrons used in chemical bonds, so they
are show in electron ...
Formation of Cations
• Atoms of the metallic elements tend to lose
their valence shell electrons leaving 8 in the
next lev...
Neutral
Sodium Atom

+
Na

Whoa…I just
got smaller…
Neutral
Chlorine Atom

Cl

Now I’m bigger
and stronger….
Transition Metals
• For transition metals, the charges of
cations may vary.
• For example, elements such as
iron, nickel a...
Formation of Anions

• A anion is an atom or group of atoms with a
negative charge.
• The gain of a negatively charged ele...
Vocabulary Cards

• Valence electron
• Octet Rule
• Transition Metal
SUM IT UP
Name the
following ions
properly.
FClCa+2
O-2
Electron Configurations
• An electron configuration is a way to
show the electrons in a particular
atom in the proper orde...
LET’S PRACTICE!

1s 2s
2

1

1s 2s 2p
2

2

5

1s 2s 2p 3s 3p
2
10
3
4s 3d 4p
2

2

6

2

6
Vocabulary Cards

• Electron configuration
POST IT UP
What is the electron
configuration for carbon?
I S!
TH
OT
IG

IN
EE
DH

EL
P!
7.2 Ionic Bonds and Ionic
Compounds
• Compounds composed of cations and
anions are called ionic compounds.
• Ionic compoun...
Formula Units
• A chemical formula shows the kinds and
numbers of atoms in the smallest
representative unit of a substance...
Let’s Practice
• How many kinds of atoms are in each of
these ionic compounds?

• NaCl
• MgCl2
• Ca(OH)2
• Ca3(PO4)2
Properties of Ionic Compounds

• Most ionic compounds are
crystalline solids at room
temperature.
• Ionic compounds genera...
Vocabulary Cards

• Ionic Bond
• Formula Unit
SUM IT UP

How many kinds of
each of these atoms
are in this
compound?
Ca (C2H6O2)2
8.1 Molecular Compounds.
• Some compounds are not ionic.
• Instead of giving or taking electrons, these
compounds share el...
Molecular Formulas
• A molecular formula is the chemical
formula of a molecular compound.
• It shows how many of each elem...
8.2 The Nature of Covalent
Bonding
• In forming covalent bonds, electron
sharing usually occurs so that atoms
attain the e...
Diagrams
• An electron dot diagram represents the
shared pairs of electrons in a molecule.
• Each bond is two electrons or...
Lone unshared
pairs
Polyatomic ions
• A polyatomic ion is a tightly bound
group of atoms that has a positive
or negative charge and behaves li...
Vocabulary Cards

• Covalent bond
• Molecule
• Polyatomic ion
• Unshared pair
SUM IT UP

Draw the
structural
diagram for
water.
8.4 Polar Bonds and Molecules
• Covalent bonds involve sharing between atoms.
• However, some atoms are more electronegati...
Hydrogen Bonds
• Hydrogen bonds occur when a hydrogen that
is covalently bonded to another atom will be
weakly attracted t...
Vocabulary Cards

• Polar molecule
• Hydrogen bond
POST IT UP
Why is water polar?
I S!
TH
OT
IG

IN
EE
DH

EL
P!
Science Swag

Create an accurate model for a chemical
compound. Label the atoms and the bonds.
Bigger models with more ato...
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
Chapter 7 and 8 notes
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Chapter 7 and 8 notes

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chemistry, ionic and covalent bonding, electron configurations, counting molecules and atoms.

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Transcript of "Chapter 7 and 8 notes"

  1. 1. Chapter 7 and 8 Ionic and Covalent Bonding
  2. 2. 7.1 Ions • Valence Electrons are the electrons in the highest occupied energy level of an element’s atoms. • The number of valence electrons determines the chemical properties of an element. • To find the number of valence electrons in an atom of a representative element, look at the group number. (see table 7.1)
  3. 3. Valence Electrons • Valence electrons are usually the only electrons used in chemical bonds, so they are show in electron dot structures. • In forming compounds, atoms tend to achieve the electron configuration of a noble gas. • This is called the Octet Rule. • All atoms want to have 8 electrons in their outer or valence shell.
  4. 4. Formation of Cations • Atoms of the metallic elements tend to lose their valence shell electrons leaving 8 in the next level down. • An atom’s loss of valence of electrons produces a cation, or positively charged ion. • Remember, an ion is a charged atom that has lost or gained electrons during the chemical bonding process.
  5. 5. Neutral Sodium Atom + Na Whoa…I just got smaller…
  6. 6. Neutral Chlorine Atom Cl Now I’m bigger and stronger….
  7. 7. Transition Metals • For transition metals, the charges of cations may vary. • For example, elements such as iron, nickel and copper may lose 1 to three electrons depending on the chemical compound.
  8. 8. Formation of Anions • A anion is an atom or group of atoms with a negative charge. • The gain of a negatively charged electron by a neutral atom will create an anion. • Non-metals typically form anions. • The name of the anion is not the same as the name of the atom. • It usually ends in –ide. (See table 7.2)
  9. 9. Vocabulary Cards • Valence electron • Octet Rule • Transition Metal
  10. 10. SUM IT UP Name the following ions properly. FClCa+2 O-2
  11. 11. Electron Configurations • An electron configuration is a way to show the electrons in a particular atom in the proper order. • Since electrons are arranged in shells, each shell has a different name. • Use the periodic table to figure out the electron configuration for any atom.
  12. 12. LET’S PRACTICE! 1s 2s 2 1 1s 2s 2p 2 2 5 1s 2s 2p 3s 3p 2 10 3 4s 3d 4p 2 2 6 2 6
  13. 13. Vocabulary Cards • Electron configuration
  14. 14. POST IT UP What is the electron configuration for carbon? I S! TH OT IG IN EE DH EL P!
  15. 15. 7.2 Ionic Bonds and Ionic Compounds • Compounds composed of cations and anions are called ionic compounds. • Ionic compounds are usually composed of a a metal and other nonmetals. • Although they are composed of ions, they are electrically neutral…meaning no charges or their charges cancel out. • Bonds that hold ionic compounds together are called ionic bonds.
  16. 16. Formula Units • A chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance. • A formula unit is the lowest wholenumber ratio of ions in an ionic compound. • The chemical formula is not always the lowest whole number ratio.
  17. 17. Let’s Practice • How many kinds of atoms are in each of these ionic compounds? • NaCl • MgCl2 • Ca(OH)2 • Ca3(PO4)2
  18. 18. Properties of Ionic Compounds • Most ionic compounds are crystalline solids at room temperature. • Ionic compounds generally have high melting points. • Ionic compounds can conduct an electric current when melted or dissolved in water.
  19. 19. Vocabulary Cards • Ionic Bond • Formula Unit
  20. 20. SUM IT UP How many kinds of each of these atoms are in this compound? Ca (C2H6O2)2
  21. 21. 8.1 Molecular Compounds. • Some compounds are not ionic. • Instead of giving or taking electrons, these compounds share electrons to complete their Octet. • This is called a covalent bond. • A molecule is a neutral groups of atoms joined by a covalent bond. • A diatomic molecule is a molecule consisting of only two atoms. • A compound composed of molecules is called a molecular compound.
  22. 22. Molecular Formulas • A molecular formula is the chemical formula of a molecular compound. • It shows how many of each element a molecule contains. • A molecular formula does not tell you about a molecule’s structure.
  23. 23. 8.2 The Nature of Covalent Bonding • In forming covalent bonds, electron sharing usually occurs so that atoms attain the electron configuration of a noble gas. • Combinations of nonmetallic elements in groups 4A, 5A, 6A and 7A are likely to form covalent bonds. • They share electrons to achieve an octet like a noble gas.
  24. 24. Diagrams • An electron dot diagram represents the shared pairs of electrons in a molecule. • Each bond is two electrons or two dots. • A structural formula represents the covalent bonds by dashes and shows the arrangement of the atoms. • Each dash will equal two electrons. • A pair of valence electrons not shared between atoms is called an unshared pair, lone pair or nonbonding pair.
  25. 25. Lone unshared pairs
  26. 26. Polyatomic ions • A polyatomic ion is a tightly bound group of atoms that has a positive or negative charge and behaves like a unit. • A group of atoms may be covalently bonded as a polyatomic ion but since the whole unit has a charge, it can bond with other charged ions.
  27. 27. Vocabulary Cards • Covalent bond • Molecule • Polyatomic ion • Unshared pair
  28. 28. SUM IT UP Draw the structural diagram for water.
  29. 29. 8.4 Polar Bonds and Molecules • Covalent bonds involve sharing between atoms. • However, some atoms are more electronegative than others meaning they tend to attract more electrons than other atoms. • When all the electrons are shared equally, it is a nonpolar covalent bond. • When one atom attracts electrons more strongely than the other atom, a polar covalent bond forms. • The atom that attracts more electrons become slightly negative while the other becomes slightly positive. • This is NOT the same as an ionic bond with normal charges!
  30. 30. Hydrogen Bonds • Hydrogen bonds occur when a hydrogen that is covalently bonded to another atom will be weakly attracted to another atom on another molecule. • The partial positive charge of the hydrogen in the polar molecule, gets attracted to the partially negative charge on another molecule. • Water usually forms hydrogen bonds. • As a result, life is possible.
  31. 31. Vocabulary Cards • Polar molecule • Hydrogen bond
  32. 32. POST IT UP Why is water polar? I S! TH OT IG IN EE DH EL P!
  33. 33. Science Swag Create an accurate model for a chemical compound. Label the atoms and the bonds. Bigger models with more atoms get more points.
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