ionic and covalent bonding
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Ionic and Covalent bonding. David A. Katz Pima Community College Tucson, AZ. Ionic Bonding. Between a metal with low ionization energy ( little energy required to remove an electron) and a non-metal with high electronegativity and electron affinity

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ionic and covalent bonding

Ionic and Covalent bonding

David A. Katz

Pima Community College

Tucson, AZ

ionic bonding
Ionic Bonding

Between a metal with low ionization energy

( little energy required to remove an electron)

and a non-metal with high electronegativity and electron affinity

( wants to grab an electron towards it)

lewis structures for ionic compounds

••

2+

2-

••

Ba

O

Ba

O

••

••

••

••

••

Cl

••

••

2+

-

••

Mg

Mg

2

Cl

••

••

••

••

Cl

••

••

Lewis Structures for Ionic Compounds

BaO

MgCl2

properties of ionic compounds
Properties of Ionic Compounds
  • Held together by strong electrostatic forces
  • Opposite charges attract
  • High melting points and boiling points
  • Regular structures – giant ionic lattices
  • When melted or dissolved ionic compounds conduct electricity
covalent bond
Covalent Bond
  • Between two elements with high ionization energy ( do not give up electrons easily) and high electronegativity ( try to grab the electron to each of them)
  • Here neither atom is willing to give up its electron
  • Instead the nuclei share the electrons between them
lewis structures
Lewis Structures
  • Lewis structures are representations of molecules showing all electrons, bonding and non-bonding

Example :

Li2 O

multiple covalent bonds
Multiple Covalent bonds
  • More than one pair of electrons can be shared between the same atoms

O2 N2

properties of covalent molecules
Properties of Covalent Molecules
  • Contain non-metals
  • Weak bonds
  • Valence electrons are shared between atoms
  • Polar molecules dissolve in polar solvents
  • Volatile
  • Low melting and boiling points
  • Insoluble in water
  • Non polar compounds do not conduct electricity; polar compounds can conduct small amounts of electricity
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