Unit 2 Review - Section 1
Atomic Structure and Mass
Which subatomic particles are
responsible for…
Element identity?
Mass?
Charge?
Chemical Behavior?
Which subatomic particles are
responsible for…
Element identity? Protons
Mass? Protons and neutrons
Charge? Protons and electrons
Chemical Behavior? electrons
Which subatomic particles are
found in the nucleus?
Which subatomic particles are found
in the nucleus?
Protons and neutrons
Which subatomic particles have the
smallest mass?
Which subatomic particles have the
smallest mass?
Electrons
Which subatomic particles have a
positive charge?
Which subatomic particles have a
positive charge?
Protons
Isotopes have the same number of
protons, but different numbers of
________________.
Isotopes have the same number of
protons, but different numbers of
Neutrons
When you add up the protons and
neutrons, do you get
the mass number or
the average atomic mass?
When you add up the protons and
neutrons, do you get
the mass number or
the average atomic mass?
Mass number
Which is found in the periodic table,
the mass number or
the average atomic mass?
Which is found in the periodic table,
the mass number or
the average atomic mass?
Average atomic mass
An atom has 26 protons, 30
neutrons, and 26 electrons.
What is its atomic number?
What is its mass number?
An atom has 26 protons, 30
neutrons, and 26 electrons.
What is its atomic number? 26
What is its mass number? 56
An atom has 7 protons, 8 neutrons,
and 7 electrons.
What element is it?
What is its mass number?
An atom has 7 protons, 8 neutrons,
and 7 electrons.
What is its atomic number? nitrogen
What is its mass number? 15
For the isotope bromine-79,
what is its mass number?
what is its atomic number?
how many neutrons does it have?
For the isotope bromine-79,
what is its mass number? 79
what is its atomic number? 35
how many neutrons does it have? 44
For the isotope copper-64,
how many neutrons does it have?
For the isotope copper-64,
how many neutrons does it have? 35
For the isotope sodium-24,
how many neutrons does it have?
For the isotope sodium-24,
how many neutrons does it have? 13
For the isotope lithium-7,
how many neutrons does it have?
For the isotope lithium-7,
how many neutrons does it have? 4
For the isotope silver-109,
write the isotope symbol?
For the isotope silver-109,
write the isotope symbol?
109
47
Ag
For the isotope potassium-41,
write the isotope symbol?
For the isotope potassium-41,
write the isotope symbol?
41
19
K
For the isotope symbol below,
write the isotope name?
81
35
Br
For the isotope symbol below,
write the isotope name?
81
35
Br
Bromine-81
For the isotope symbol below,
write the isotope name?
238
92
U
For the isotope symbol below,
write the isotope name?
238
92
U
Uranium-238
Lithium has two naturally occurring
isotopes. Using the information
below, calculate the average atomic
mass of lithium.
lithium-6 (mass = 6.01 amu, abundance = 7.6%) and
lithium-7 (mass = 7.02 amu, abundance = 92.4%).
Lithium has two naturally occurring
isotopes. Using the information
below, calculate the average atomic
mass of lithium.
lithium-6 (mass = 6.01 amu, abundance = 7.6%) and
lithium-7 (mass = 7.02 amu, abundance = 92.4%).
Hint: First calculate the mass contributions of each
isotope!
Lithium has two naturally occurring
isotopes. Using the information
below, calculate the average atomic
mass of lithium.
lithium-6 (mass = 6.01 amu, abundance = 7.6%) and
lithium-7 (mass = 7.02 amu, abundance = 92.4%).
Lithium-6: 6.01 amu x 0.076 = 0.46 amu
Lithium-7: 7.02 amu x 0.924 = 6.49 amu
Avg atomic mass = 0.46 + 6.49 =
6.94 amu
For more practice…
• http://www.sciencegeek.net/Chemistry/taters
/Unit1Numbers2.htm
• http://www.sciencegeek.net/Chemistry/taters
/Unit1AtomicNumbers.htm