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WorksheetsCh. 7 Understanding the Atom Study Guide
Total questions: 90
Worksheet time: 2hrs 12mins
An ________ is the smallest piece of an element
atom
proton
matter
All atoms of an element have the same number of
protons
electrons
neutrons
What is the smallest particle
electron
neutron
proton
What particle has a (-) negative charge?
proton
neutron
electron
What particle has a (+) positive charge?
proton
neutron
electron
What particle has a (0) neutral charge?
proton
neutron
electron
What is the mass of a proton
1
0
What is the mass of a electron
1
0
What is the mass of a neutron
1
0
The atomic number equals _________________
mass of the atom
number of protons
number of neutrons
Atoms of an element with different number of neutrons
isotope
ion
radioactive
Atoms of an element with different number of electrons
isotope
ion
radioactive
What is the location of a proton?
nucleus
electron cloud
What is the location of a neutron?
nucleus
electron cloud
What is the location of a electron?
nucleus
electron cloud
A neutral atom loses one or more electrons. The result is ________.
the atom has a negative charge
the atom has a positive charge
the atom has a neutral charge
A neutral atom gains one or more electrons. The result is ________.
the atom has a negative charge
the atom has a positive charge
the atom has a neutral charge
What is #1
proton
neutron
electron
nucleus
What is #2
proton
neutron
electron
nucleus
What is #3
proton
neutron
electron
nucleus
What is #4
proton
neutron
electron
nucleus
The mass of an atom is the # of protons + ______________
# of electrons
# of neutrons
What did Democritus believe an atom was?
a solid, indivisible object
a tiny particle with a nucleus
a nucleus surrounded by an electron cloud
a tiny nucleus with electrons surrounding it
If an ion contains 10 electrons, 12 protons, and 13 neutrons, what is the ion's charge?
2-
1-
2+
3+
J. J Thomson's experimental setup is shown. What is happening to the cathode rays?
They are attracted to the negative plate.
They are attracted to the positive plate.
They are stopped by the plates.
They are unaffected by either plate.
How many neutrons does iron-59 have?
30
33
56
59
Why were Rutherford's students surprised by the results of the gold foil experiment?
They didn't expect the alpha particles to bounce back from the foil.
They didn't expect the alpha particles to continue in a straight path.
They expected only a few alpha particles to bounce back from the foil.
The expected the alpha particles to be deflected by electrons.
Which determines the identity of an element?
its mass number
the charge of the atom
the number of neutrons
the number of protons
What does the figure show?
two different elements
two different ions
two different isotopes
two different protons
How is Bohr's atomic model different from Rutherford's model?
Bohr's model has a nucleus.
Bohr's model has electrons.
Electrons in Bohr's model are located farther from the nucleus.
Electrons in Bohr's model are located in circular levels.
Which best describes an atom?
a particle with a single negative charge
a particle with a single positive charge
the smallest particle that still represents a compound
the smallest particle that still represents an element
Which is true about the size of an atom?
It can only be seen using a scanning tunneling microscope.
It is about the size of the period at the end of this sentence.
It is large enough to be seen using a magnifying lens.
It is too small to see with any type of microscope.
Whose model for the atom is shown?
Bohr's
Dalton's
Rutherford's
Thomson's
What structure did Rutherford discover?
the atom
the electron
the neutron
the nucleus
Nuclear decay occurs when an unstable atomic nucleus changes into another nucleus by emitting ______________.
elements
isotopes
air
radiation
Based on his research of the atom, James Chadwick concluded that
a cathode ray has a negative charge
the electrons are found in an electron cloud
the nucleus contains neutrons as well as protons
the mass of an atom is concentrated in its center
What allowed scientists to see an individual atoms for hte first time?
cathode ray tubes
photographic plates
compound microscopes
scanning tunneling microscopes (STM)
An ion that has a negative charge is formed when an atom
loses neutroons
loses electrons
gains neutrons
gains electrons
Two neutral atoms that have the same atomic number and different mass numbers are
ions
isotopes
alpha particles
different elements
The ____ is a weighted average that reflects the abundance of different isotopes.
ions
average atomic mass
mass number
elements
The ____ is determined by adding the number of protons and neutrons in an atom.
neutrons
mass number
atomic number
elements
The element's ____ and the number of protons in the nucleus of its atoms are always the same.
atomic number
mass number
average atomic mass
protons
Alpha decay releases ____
nothing
1 proton
alpha particle
high energy electron
An alpha particle is ____
energy
1 high energy electron
2 protons and 2 neutrons
nothing
An alpha particle changes the atomic number by ____
increasing by 1.
decreasing by 1.
increasing by 2
decreasing by 2
A beta particle consists of ___
a high-energy electron.
2 protons and 2 neutrons
energy
1 proton
Beta decay changes the atomic number by
increasing by 1
decreasing by 1
increasing by 2
decreasing by 2
Gamma radiation is weak radiation
True
False
Gamma decay consists of
2 protons and 2 neutrons
energy
2 protons and 2 neutrons
1 high-energy electron
Gamma decay changes the atomic number.
True
False
Rutherford's model shows
the mass and positive charge of an atoms in the nucleus
the atoms as a positive sphere with negative charges
as a ray of light
as an electron cloud
Thomson's model shows an atoms as
the mass and positive charge concentrated at the center with electrons outside the nucleus
as a positive sphere with negative charges distributed throughout.
as an electron cloud around a nucleus
How are protons and neutrons different?
They are both found in the nucleus
They both have positive charges
They are both neutral
Protons have a positive charge and neutrons have no charge.
What was the problem with Bohr's model?
The atoms were placed in a cloud with no definite positions.
The atoms were placed in a concentric orbit to another by gaining or losing energy.
The atoms were placed in the nucleus
Nothing was wrong with it.
How did the modern atomic model correct Bohr's problem?
Placed the electrons in a cloud with no definite position
Placed the electrons in orbitals around the nucleus.
Placed the electrons in the positive nucleus.
It didn't correct anything at all.
Which scientist discovered the electrons?
Dalton
Thomson
Atristotle
Bohr
Rutherford and his students did experiments that showed
quark
nucleus
proton
electron
Bohr discovered that electrons are located in
the nucleus
inside protons
electron cloud
circular orbits around the nucleus
The smallest particle of an element that still represents that element.
Nucleus
electron
proton
atom
Which one of the following parts of the atom is the smallest?
atom
neutron
quark
Which one of the following is the correct order of scientific contribution of the atom?
Chadwick, Dalton, Bohr, Rutherford, Democritus,Thomson
Thomson, Democritus,Rutherford, Bohr, Dalton ,Chadwick
Dalton, Chadwick ,Bohr, Rutherford, Democritus,Thomson
Democritus, Dalton, Thomson, Rutherford, Bohr, Chadwick
True or False: The Atom is made mostly of empty space.
True
False
J.J. Thomson used this glass tube in his experiments...
a thermometer
a cathode ray tube
a Pyrex glass tube
a capillary tube
Sheldon's joke if accurate because...
neutrons are neutral
neutrons can move within the atom
neutrons are negatively charged
neutrons orbit the nucleus
In the modern model of the atom, the electrons are said to be most likely located here...
in the nucleus
in orbitals
in the electron cloud
on the outer edge
These small particles make up both protons and neutrons...
ions
isotopes
beta particles
quarks
The sum of the number of protons and neutrons in an atom is the...
atomic number
mass number
average atomic mass
charge
This number tells me how many protons in an atom of the element...
mass number
atomic number
average atomic mass
atomic weight
The average mass of an element’s isotopes is...
the atomic number
the mass number
Avogadro's number
the average atomic mass
Elements that spontaneously emit radiation are said to be...
on fire
radioactive
toxic
bioluminescent
A process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation is...
particle acceleration
ionic bonding
covalent bonding
nuclear decay
Made up of 2 protons and 2 neutrons, this is emitted by some radioactive substances...
alpha particles
beta particles
gamma rays
ions
This fast-moving, high energy electron is emitted by the radioactive decay of an atomic nucleus...
alpha particle
beta particle
gamma ray
super electron
An atom that is no longer neutral because it has gained or lost electrons is...
an alpha particle
an ion
an isotope
a quark
When a neutral atom loses one or more electrons and has more protons than electrons it is called...
a positive ion, or cation
a negative ion, or anion
a beta particle
an alpha particle
When a neutral atom gains one or more electrons and has more electrons than protons it is called...
an electron cloud
an isotope
a positive ion, or cation
a negative ion, or anion
Over 2,000 years ago, many people thought matter was made of these elements (check all that are true)
water and air
Earth and fire
gold and silver
hydrogen and helium
This influential Greek philosopher was one of the main reasons Democritus ideas on atomic theory were considered incorrect and shelved for over 2,000 years.
Aristotle
Dalton
J.J. Thomson
Bohr
He revisited Democritus' ideas on the atom and developed the Atomic Theory.
Aristotle
Dalton
J.J. Thomson
Bohr
He discovered the electron and realized these particles have less mass than that of an atom.
Dalton
J.J. Thomson
Rutherford
Chadwick
1 in 10,000 alpha particles shot at the gold foil bounced straight back, which implies...
atoms are seldom neutral
atoms are mostly empty space
isotopes exist
there are neutrons present
He was Rutherford's colleague and discovered the nucleus contained neutrons...
Dalton
J.J. Thomson
Chadwick
Bohr
This would best be described as...
The Modern Atomic Model
The Plum Pudding Model
the Dalton model
the Bohr model
He proposed the electrons move in a circular orbit (in energy levels) around the nucleus...
Dalton
Bohr
Chadwick
Rutherford
"I was sure all of those alpha particles would travel straight through that gold foil!" Umm... I guess not, Mr. ________________.
Dalton
Aristotle
Rutherford
Chadwick
"No, my friends, the electrons are in orbit around the nucleus." This is...
Niels Bohr
James Chadwick
J.J. Thomson
Earnest Rutherford
"I'm telling you- the atomos is mostly empty space! Why won't anyone believe me? In about 2,000 years, you'll realize ________________ was right about this!"
Aristotle
Democritus
Dalton
Bohr
"Silly, silly Democritus- matter is only made out of the 4 elements- fire, water, air, and earth.... What do you mean I am wrong? Don't you know who I am! I'm..."
Rutherford
Dalton
Thomson
Aristotle
"My husband and I sacrificed EVERYTHING in the name of science. We studied X-Rays and uranium rays. Perhaps you have heard of us? We are..."
Frederic and Irene Joliot
Edvard Moser and May Britt
Pierre and Marie Curie
Gerty Theresa and Carl Ferdinand Cori
