Download Chapter 4.2: The Structure of Atoms

Chapter 4.2 Review
Chapter 4 Structure of the Atom
Explain why the mole is used as
a counting unit for atoms
•Atoms are too
small to count
individually
Chapter 4 Structure of the Atom
Draw and label the parts of the
helium atom.
Chapter 4 Structure of the Atom
Draw and label the parts of the
helium atom.
•2 protons and 2
neutrons in the
nucleus
Chapter 4 Structure of the Atom
Explain the difference between
the atomic number and the mass
number of the atom.
•Atomic Number
•# of protons
Chapter 4 Structure of the Atom
Explain the difference between
the atomic number and the mass
number of the atom.
•Mass Number
•# of nucleons
Chapter 4 Structure of the Atom
Explain the difference between
the atomic number and the mass
number of the atom.
•Mass Number
•# of neutrons
and protons
Isotopes of Hydrogen
Atomic Number 1
Isotope
Protium
deuterium
tritium
H4
Mass #
P+
N
e-
1
2
3
4
1
1
1
1
0
1
2
3
1
1
1
1
Mass
in
Grams
A
B
C
D
Grams/
mole
Number
of Moles
Element
Chapter 4 Structure of the Atom
Determine the mass in grams of
each of the following.
•A = 12 g of Ne
•B = 658 g of Xe
•C = 150 g of Se
•D = 650 g of Au
Word
Definition
Derivation
Atomic
Number
The number of protons in the nucleus of an
atom
Isotope
Same number of protons but a different
number of neutrons
German Atomzahl
1915
(1820)
1910-15 Greek
Equal Place
Mass Number
# of protons + # of neutrons in the nucleus
Mole
SI unit used to measure the amount of a
substance 6.02 x 10 23 particles
Neutron
Subatomic particle with no charge found in
the nucleus
Proton
Subatomic particle with a positive charge
found in the nucleus
The number of which determines the element
Unified
Atomic Mass
Rutherford et al
1920-25
1900-05 German
Molekule =
Molecule
Latin
Neither of Two
Greek
First
Unit of mass
1961 archaic since
Exactly 1/12th the mass of a carbon atom with
2010 OUP
Chapter 4 Structure of the Atom
What is the difference between
mass number and atomic mass?
•Mass # =
•sum of protons
and neutrons
Chapter 4 Structure of the Atom
What is the difference between
mass number and atomic mass?
• Atomic Mass=
• Average mass of atoms
using relative abundance
of isotopes.
Chapter 4 Structure of the Atom
Apply Concepts: Complete the
Chart
•?
Atom
Atomic #
Mass #
A
7
14
B
C
15
13
D
E
8
14
87
38
Number
of
Neutrons
50
49
Element
Chapter 4 Structure of the Atom
Which two atoms in the table are
isotopes of the same element
•A and B are isotopes
of Nitrogen
•Nitrogen-14
•Nitrogen-15
Chapter 4 Structure of the Atom
Explain your answer.
•= Protons same
element, different
neutrons an
isotope
Chapter 4 Structure of the Atom
How many electrons does atom
D contain?
•P = E for a
neutral atom
Chapter 4 Structure of the Atom
How many moles of glucose are
in 300 grams of glucose.
•Molar mass of
glucose =
•180.2 g/mol
Chapter 4 Structure of the Atom
How many moles of glucose are
in 300 grams of glucose.
•300 g of glucose
•180.2 g/mol
Chapter 4 Structure of the Atom
How many moles of glucose are
in 300 grams of glucose.
•1.66 mol