Chapter 4 & 25 Review
Atomic History
• Who lived in BC times and first suggested the
idea of atoms?
• What are the parts of Dalton’s atomic theory?
• What did Rutherford find out about the volume
of the atom from his discovery of the nucleus?
• Essay: What observations by Rutherford led to
the hypothesis that atoms are mostly empty
space and that almost all the mass of the atom is
contained in the atomic nucleus?
Subatomic particles
• What are the charge and mass of protons,
neutrons, and electrons?
• What particles are found in the nucleus?
• All atoms of the same element have the same
number of ________.
• What unit is used to measure weighted
average atomic mass?
Isotopes
• What does the number 16 mean in oxygen-16?
• Using the periodic table, determine the number
of neutrons in 35Cl.
• How many protons, neutrons and electrons are
in an atom with atomic number 15 and mass
number 31?
• Determine the number of neutrons in 199F.
• List the number of protons, neutrons and
electrons in 4019K.
Isotopes
• Us the periodic table to determine the number of
electrons in a neutral atom of barium.
• Use the periodic table to determine the number
of protons in bromine.
• What is the atomic number for an element with
61 neutrons and a mass number of 108?
• What is the mass number for an aluminum atom
with 13 neutrons in its nucleus?
• Use the periodic table to determine the number
of neutrons in iodine-127.
Average atomic mass
• Copper has two naturally occurring isotopes,
copper-63 and copper-65. Which is more
abundant if the average atomic mass of
copper is 63.546?
• Consider element Z that has 2 naturally
occurring isotopes. The isotope with a mass of
10.98 is 79.9% abundant and the isotope with
a mass of 9.97 is 20.1% abundant. What is the
average atomic mass of element Z?
Radiation
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What is the charge of a gamma ray?
What is the least penetrating form of radiation?
Write the symbol used for an alpha particle.
Write the symbol used for a beta particle
When small nuclei combine to form a heavier
nucleus, it is called nuclear ________.
• What does neutron absorption accomplish in a
nuclear reactor?
• What is radiation therapy used for?
Nuclear Equations
• 21284Po → 42He + ____
• 5828Ni → 0-1e + ____
• 147N + ___ → 146C + 11H
• When uranium-235 (atomic number 92) emits an
alpha particle, what element is produced (include
mass number)?
• When magnesium-24 (atomic number 12) emits a
beta particle, what element is produced?
• __14Si → 42He + 33_____
Half-Life
• The half-life a radioactive material is 10 years.
How long will it take for one half of the
original amount of material to decay?
• The half-life of sodium-24 is 15 hours. How
much remains from a 2.0 g sample after 45
hours?
• What is the half-life of an isotope if after 30
days, 0.125 g remain from a 1.0 g starting
sample?
Isotope Chart
#p
Carbon-13
Xenon-131
Sodium-24
Oxygen-15
#n
#e
Atomic
Mass
number number
Vocabulary – Ch 4
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Atom
Atomic mass
Atomic mass unit
Atomic number
Electron
Isotope
Mass number
Neutron
Nucleus
Proton
Vocabulary – Ch 25
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Alpha particle
Beta particle
Gamma radiation
Positron
Transmutation
Transuranium element