Nomenclature:
Elements and Compounds
The Big Picture
The Universe
Matter
Energy
(Has mass, occupies space)
(Capacity to do work)
Single Substance
Mixture
(Fixed composition)
(Variable composition)
Element
Compound
(Only one kind of atom)
(More than one type of atom)
Molecular
(Unit = more than
1 atom)
Atomic
Ionic
Molecular
(Unit = single atom)
Contains Ions
(metal + nonmetal)
(cations + ions)
Contains Neutral Molecules
(nonmetal + nonmetal)
(no ions present)
Diatomic
Polyatomic
(Unit = 2 atoms)
(Unit = > 2 atoms)
The Big Picture
The Universe
Matter
Energy
(Has mass, occupies space)
(Capacity to do work)
Single Substance
Mixture
(Fixed composition)
(Variable composition)
Element
Compound
(Only one kind of atom)
(More than one type of atom)
Molecular
(Unit = more than
1 atom)
Atomic
Ionic
Molecular
(Unit = single atom)
Contains Ions
(metal + nonmetal)
(cations + ions)
Contains Neutral Molecules
(nonmetal + nonmetal)
(no ions present)
Diatomic
Polyatomic
(Unit = 2 atoms)
(Unit = > 2 atoms)
The Focus
• We will be focusing on Elements and Compounds
• What are they?
• How are they created?
• What are their formulas?
• How are they named?
The Goals
• Given the name of an element or compound,
you should be able to give the formula
• Given the formula of an element or compound,
you should be able to give the name
Elements
• Contain just one type of atom
• Unit may contain:
• Single atom
• Two atoms
• Many atoms
• Molecule = two or more atoms joined
together chemically in a neutral unit
Elements
• Atomic elements
• Contain single atoms
Cu
Al
C
P
Mg Fe
• Diatomic elements
• Contain 2 atoms of the same type
• 2 atom molecules
H2
N2
O2
F2 Cl2
Br2
Learn These Now!!!
I2
Diatomic Elements
• These seven diatomic elements must always
be written as diatomic
• These elements do not exist as individual atoms
• Nitrogen is never N when by itself
• It is always N2
Examples
Write the formulas for the following elements:
• Potassium
• Magnesium
• Chlorine
• Oxygen
Examples
Write the formulas for the following elements:
• Potassium
K
• Magnesium
Mg
• Chlorine
Cl2
• Oxygen
O2
Elements
• Polyatomic elements
• Contain >2 atoms
O3
P4
S8
C60
Compounds
• Contain more than one type of atom
• We will learn to name 3 types of compounds
• Binary Molecular Compounds
• Ionic Compounds
• Acids
• Must learn to recognize the type so know
which rules of naming to apply
Nomenclature:
Elements and Compounds