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CHEMISTRY QUIZ
REVIEW
GENERAL SCIENCE – UNIT 3
CLICK TO BEGIN
WHICH SUB-ATOMIC PARTICLE IS
PICTURED?
+
+
+
+
+
+
Neutron
Electron
Proton
INCORRECT...TRY AGAIN.
• The neutron is found in the nucleus, however it is
neutral. The sub-atomic particle pictured is positive.
INCORRECT…TRY AGAIN.
• The electron is found orbiting outside of the nucleus.
It has a negative charge.
CORRECT!
• The sub-atomic particle pictured is the proton. It is
found in the nucleus and has a positive charge.
HOW MANY ELECTRONS ARE IN
OXYGEN – 17?
4
8
12
INCORRECT…TRY AGAIN.
• Remember, in a neutral atom, the electrons are
equal to the protons (atomic number). If there are 4
electrons in the neutral atom, then it only has 4
protons. The element with 4 protons and 4 electrons
is Beryllium.
INCORRECT…TRY AGAIN.
• Remember, in a neutral atom, the electrons are
equal to the protons (atomic number). If there are
12 electrons in the neutral atom, then it only has 12
protons. The element with 12 protons and 12
electrons is Magnesium.
CORRECT!
• In a neutral atom, the electron number is equal to
the proton number. The proton number identifies
the element. Oxygen is element 8 on the periodic
table, therefore it has 8 protons and 8 electrons.
WHICH SUB-ATOMIC PARTICLE
IDENTIFIES THE ATOM?
Proton
Neutron
Electron
INCORRECT…TRY AGAIN.
• The neutrons are found in the nucleus with the
protons, however, they have no charge and they
can differ from atom to atom.
INCORRECT…TRY AGAIN.
• The electrons are found orbiting outside of the
nucleus. They determine reactivity; they do not
identify the atom.
CORRECT!
• The proton identifies the atom. The proton number is
the same as the atomic number, which the periodic
table is arranged by.
WHICH SUB-ATOMIC PARTICLE HAS A
NEGATIVE CHARGE
-
-
-
Neutron
Electron
Proton
INCORRECT…TRY AGAIN.
• The protons are found inside the nucleus and have
a positive charge.
INCORRECT…TRY AGAIN.
• The neutrons are found inside the nucleus and have
a neutral charge.
CORRECT!
• The electron, orbiting around the outside of the
nucleus, have a negative charge.
WHICH SUB-ATOMIC PARTICLE IS
RESPONSIBLE FOR THE ATOM’S MASS?
Neutron
Electron
Proton
INCORRECT…TRY AGAIN.
• The neutrons are found inside the nucleus with the
protons. They contribute to the mass, however,
since they are neutral (they have no charge), they
do not determine the mass.
INCORRECT…TRY AGAIN.
• The electrons are found orbiting outside of the
nucleus. All of the atom’s mass is found inside the
nucleus, therefore, the electrons do not impact the
mass of the atom.
CORRECT!
• The proton, with its positive charge, is responsible for
the mass of the atom. To determine which element
has the greatest mass, you locate the element with
the highest atomic number (# of protons).
HOW MANY PROTONS ARE IN THE
PICTURED ATOM?
Neutral
Positive
Negative
7
6
5
INCORRECT…TRY AGAIN.
• The question is asking for the number of protons.
You have identified the number of grey circles, or
neutrons. Neutrons are found inside the nucleus
with the protons. Neutrons have a neutral charge.
INCORRECT…TRY AGAIN.
• The question is asking for the number of protons.
You have identified the number of blue circles, or
electrons. Electrons are found orbiting outside of
the nucleus and have a negative charge.
CORRECT!
• The proton is located inside the nucleus. This
eliminates the blue circles. Since protons have a
positive charge, they are red. If you count the red
circles, there are 5 protons.
HOW MANY ELECTRONS DOES AN ATOM HAVE IF IT
CONTAINS 17 NEUTRONS AND 19 PROTONS?
17
19
36
INCORRECT…TRY AGAIN.
• 36 is found by adding the protons and the neutrons.
This number is the mass number, not the number of
electrons.
INCORRECT…TRY AGAIN.
• 17 is the number of neutrons. Remember, in a
neutral atom, protons and electrons are equal to
one another.
CORRECT!
• In a neutral atom, electrons are equal to protons. IF
the atom has 19 protons, then it must have 19
electrons.
WHAT IS THE HYPHENATED NOTATION FOR AN
ATOM THAT HAS:
12 PROTONS, 8 NEUTRONS, AND 12 ELECTRONS?
Oxygen - 20
Magnesium - 12
Magnesium - 20
Oxygen - 12
INCORRECT…TRY AGAIN.
• Hyphenated Notation is the Element Name – Mass #
• 8 is the number of neutrons. This does not indicate
element name. You need to look at the protons to
determine the element name.
• Mass # is found by adding protons and neutrons
• 20 is the correct mass number. (8+12)
INCORRECT…TRY AGAIN.
• Hyphenated Notation is the Element Name – Mass #
• 8 is the number of neutrons. This does not indicate
element name. You need to look at the protons to
determine the element name.
• Mass # is found by adding protons and neutrons
• 12 is only the number of neutrons. You must add the
protons to this number.
INCORRECT…TRY AGAIN.
• Hyphenated Notation is the Element Name – Mass #
• You have the right element.
• The protons (atomic #) indicate the element name:
• 12 protons = Magnesium
• The Mass # is found by adding the protons and
neutrons. You only used the protons (12). You must
add the neutrons (8) to this number.
CORRECT!
• Hyphenated Notation is the Element Name – Mass #
• The protons (atomic #) indicate the element name:
• 12 protons = Magnesium
• The Mass # is found by adding the protons and
neutrons
• 12 + 8 = 20
THERE ARE 7 PROTONS IN THE NUCLEUS OF
THIS NEUTRAL ATOM. HOW DO YOU KNOW?
Neutral
Negative
Electrons = Protons
in a neutral atom
Neutrons = Protons
in a neutral atom
INCORRECT…TRY AGAIN.
• In a neutral atom, the number of neutrons (neutral
charge) can change. They do not have to equal
the number of protons.
CORRECT!
• In a neutral atom, protons are equal to the number
of electrons.
THE ATOMIC NUMBER IS EQUAL TO THE
NUMBER OF WHICH SUB-ATOMIC PARTICLE?
Electron
Neutron
Proton
INCORRECT…TRY AGAIN.
• The neutron does not affect the atomic number.
The neutron is important in finding the mass number.
INCORRECT…TRY AGAIN.
• The electron does not affect the atomic number. It
determines reactivity.
CORRECT!
• The atomic number is equal to the number of
protons. This number also identifies the element on
the periodic table.
WHAT IS THE MASS NUMBER OF THE
ATOM PICTURED?
7
11
12
INCORRECT…TRY AGAIN.
• 7 is the number of electrons. Electrons do not affect
the mass number. The atom’s mass is found in it’s
nucleus.
INCORRECT…TRY AGAIN.
• 12 is the number of electrons and one of the
particles in the nucleus. Electrons do not affect the
mass number. The atom’s mass is found in it’s
nucleus.
CORRECT!
• The mass of the atom is found in the nucleus where
the protons and neutrons are located. The mass
number is equal to the number of protons added to
the number of neutrons.
WHAT IS THE NUCLEAR SYMBOL FOR AN ATOM
THAT HAS:
15 PROTONS, 6 NEUTRONS, AND 15 ELECTRONS
21
15
P
15
6
C
15
21
P
INCORRECT…TRY AGAIN.
15 protons, 6 neutrons, and 15 electrons
15
6
Mass # = protons + neutrons
* You used just protons or just
electrons
C
Element Symbol: found by #
of protons, find that # on
periodic table for element
* You used # of neutrons
Atomic # = # of protons
* You used the # of neutrons
INCORRECT…TRY AGAIN.
15 protons, 6 neutrons, and 15 electrons
15
21
Mass # = protons + neutrons
* You used just protons or just
electrons
P
Element Symbol: found by #
of protons, find that # on
periodic table for element
* This is correct
Atomic # = # of protons
•You used the # of neutrons + protons
or
•You used the # neutrons + electrons
CORRECT!
15 protons, 6 neutrons, and 15 electrons
Mass # = protons + neutrons
21
15
P
Element Symbol: found by #
of protons, find that # on
periodic table for element
Atomic # = # of protons
WHAT IS THE ATOMIC NUMBER OF THE
PICTURED ATOM?
Positive
Neutral
Negative
4
5
7
INCORRECT…TRY AGAIN.
• 4 is the number of neutral particles. These are
neutrons.
• The atomic number is not equal to the number of
neutrons.
INCORRECT…TRY AGAIN.
• 7 is the number of negative particles. These are
electrons.
• The atomic number is not equal to the number of
electrons.
CORRECT!
• The atomic number is equal to the number of
protons.
• Protons have a positive charge (the grey circles)
WHAT IS THE HYPHENATED NOTATION
FOR THE PICTURED ATOM?
Neutral
Positive
Negative
Nitrogen – 9
Boron - 9
Beryllium - 9
INCORRECT…TRY AGAIN.
• Hyphenated Notation is the Element Name – Mass #
• The protons (atomic #) indicate the element name;
these are the RED circles.
• You counted the GREY circles, which are neutral
and therefore neutrons
• The Mass # is found by adding the protons and
neutrons
• 4+5=9
INCORRECT…TRY AGAIN.
• Hyphenated Notation is the Element Name – Mass #
• The protons (atomic #) indicate the element name;
these are the RED circles.
• You counted the BLUE circles, which are negative
and therefore electrons
• The Mass # is found by adding the protons and
neutrons
• 4+5=9
CORRECT!
• Hyphenated Notation is the Element Name – Mass #
• The protons (atomic #) indicate the element name:
• Protons are positive (RED circles)
• 4 protons = Beryllium
• The Mass # is found by adding the protons and
neutrons
• 4+5=9
WHICH SUB-ATOMIC PARTICLE IS FOUND IN
THE NUCLEUS ALONG WITH THE PROTON?
+
+
+
+
+
+
Neutron
Electron
INCORRECT…TRY AGAIN.
• Electrons are found outside of the nucleus.
CORRECT!
• Neutrons are found in the nucleus with the protons.
Together the protons and neutrons make up the
mass #.
WHICH NUCLEAR SYMBOL IS AN
ISOTOPE FOR ZINC-51
51
31
Zn
54
30
Zn
51
31
Ga
INCORRECT…TRY AGAIN.
Isotopes are atoms with the same # of protons (same
element), but different #s of neutrons. This means the mass #
changes, nothing else!
Mass # has to change
because it has a different #
of neutrons.
51
31
Zn
The element name
does not change.
The atomic number, (# of
protons) does not change. If
it changes, you have a new
element.
INCORRECT…TRY AGAIN.
Isotopes are atoms with the same # of protons (same
element), but different #s of neutrons. This means the mass #
changes, nothing else!
Mass # has to change
because it has a different #
of neutrons.
51
31
Ga
The element name does not
change. By changing the
name, you’ve changed the #
of protons.
The atomic number, (# of
protons) does not change. If
it changes, you have a new
element.
CORRECT!
Isotopes are atoms with the same # of protons (same
element), but different #s of neutrons. This means the mass #
changes, nothing else!
54
30
Zn
Mass # changes because it
has a different # of
neutrons.
The element name
does not change.
The atomic number, (#
of protons) does not
change.
HOW MANY PROTONS DOES THE
REPRESENTED ATOM HAVE?
25
16
9
S
25
16
INCORRECT…TRY AGAIN.
• 25 is the mass #. This is found by adding the # of
protons to the # of neutrons
Mass #
25
16
S
INCORRECT…TRY AGAIN.
• 9 is the number of neutrons. This is found by taking
the Mass # - the Atomic #.
Mass #
25
16
The atomic
number
S
CORRECT!
• Protons are equal to the atomic number. They also
identify the atom.
25
16
The atomic
number
S
You could
find “S” on
the
periodic
table
WHICH ELEMENT HAS THE LEAST NUMBER
OF PROTONS IN THE NUCLEUS?
Calcium
#20 on table
Tin
#50 on table
Flourine
#9 on table
INCORRECT…TRY AGAIN.
• The atomic number indicates the number of
protons. This element has a higher atomic number,
therefore a higher number of protons, then another
element listed.
INCORRECT…TRY AGAIN.
• The atomic number indicates the number of
protons. This element has a higher atomic number,
therefore a higher number of protons, then another
element listed.
CORRECT!
• The atomic number indicates the number of
protons. Since Fluorine has an atomic number of 9,
then it has 9 protons. This is the least number of
protons.
HOW LONG DID IT TAKE TO DEVELOP
THE MODERN MODEL OF THE ATOM?
A short time
A long time
INCORRECT…TRY AGAIN.
• Remember, as early as Democritus, scientists have
been working on the model of the atom for
hundreds of years.
CORRECT!
• It took many scientists a long time to develop the
modern model of the atom.
(Democritus to present day)
WHICH SUB-ATOMIC PARTICLES ARE
FOUND IN THE NUCLEUS?
electrons and
neutrons
protons and
electrons
protons and
neutrons
INCORRECT…TRY AGAIN.
• Electrons are found orbiting outside of the nucleus.
• Neutrons are found inside the nucleus.
INCORRECT…TRY AGAIN.
• Electrons are found orbiting outside of the nucleus.
• Protons are found inside the nucleus.
CORRECT!
• Protons and neutrons are found in the nucleus.
Electrons are found orbiting outside of the nucleus.
WHAT IS THE NUCLEAR SYMBOL FOR
THE PICTURED ATOM?
Positive
Neutral
Negative
9
5
B
9
4
Be
7
9
F
INCORRECT…TRY AGAIN.
The mass
number is the
protons and
neutrons added
together (red
and grey) – This
is correct
The atomic number,
identifies the atom
(grey circles =
protons), you used
the red which are
neutrons.
9
4
Be
Be stands
for
Beryllium
which has
4 protons,
but our
picture has
5, which is
Boron (B).
INCORRECT…TRY AGAIN.
The mass
number is the
protons and
neutrons added
together (red
and grey) – You
used Blue which
are electrons
The atomic number,
identifies the atom
(grey circles =
protons), you used
the red + grey
which equals the
mass #.
7
9
F
F stands for
Fluorine
which has
9 protons,
but our
picture has
5, which is
Boron (B).
CORRECT!
The mass
number is the
protons and
neutrons added
together (red
and grey)
9
5
The atomic
number,
identifies
the atom
(grey
circles)
B
Since the
atomic # is
5, you find
it on the
periodic
table
WHICH OF THE FOLLOWING ATOMS
HAS THE LEAST AMOUNT OF MASS?
Red (+), Grey (0), Blue (-)
1
2
3
INCORRECT…TRY AGAIN.
• The mass is found in the nucleus. This element has a
higher atomic number, therefore a higher number of
protons, then another element listed.
INCORRECT…TRY AGAIN.
• The mass is found in the nucleus. This element has a
higher atomic number, therefore a higher number of
protons, then another element listed.
CORRECT!
• There are the least amount of protons in the nucleus,
where all of the mass is found.
WHAT IS THE ATOMIC NUMBER FOR
THE REPRESENTED ATOM?
35
20
35
Ca
55
20
INCORRECT…TRY AGAIN.
The mass
number is the
protons and
neutrons added
together
35
20
Ca
INCORRECT…TRY AGAIN.
55 would be the mass # added to the atomic #.
35
20
Ca
CORRECT!
35
20
The atomic
number,
identifies
the atom
Ca
You could look at
the periodic table
and find Ca is 20.
Atomic number (#
of protons) identifies
atom.
HOW MANY NEUTRONS DOES THE
REPRESENTED ATOM HAVE?
51
10
41
Ne
10
51
INCORRECT…TRY AGAIN.
10 would be the atomic #.
51
10
Ne
INCORRECT…TRY AGAIN.
51 would be the mass #.
51
10
Ne
CORRECT!
Mass # - Atomic # = Neutron #
The mass
number
51
10
The atomic
number
Ne
USING THE REPRESENTED ATOM, 86 IS
THE ___________ NUMBER
86
44
The number of
electrons
Ru
The number of
protons
None of the Above
All of the Above
The atomic
number
INCORRECT…TRY AGAIN.
The atomic # = proton # = electron #, which are all 44
86
44
Ru
CORRECT!
It is none of the above. 86 is the mass #
The mass
number
86
44
Ru
HOW MANY ELECTRONS DOES THE
REPRESENTED ATOM HAVE?
93
56
93
Ba
56
37
INCORRECT…TRY AGAIN.
93 is the mass #, which is protons + neutrons
93
56
Ba
INCORRECT…TRY AGAIN.
37 is the neutron#, which mass # - atomic #
93
56
Ba
CORRECT!
In a neutral atom, Atomic # = Proton # = Electron #
93
The atomic
#
56
Ba
IF YOU ADD A NEUTRON TO AN ATOM
OF POTASSIUM-27, WHAT RESULTS?
A Potassium – 28 atom
A Calcium – 27 atom
A Potassium – 27 atom
INCORRECT…TRY AGAIN.
If you add a neutron, you create an isotope. An isotope is an
element of the same name, but a different number or neutrons.
If you change the neutrons, you must change the mass #, not
the element name. To change the element name, you have to
change the number of protons.
INCORRECT…TRY AGAIN.
If you add a neutron, you create an isotope. An isotope is an
element of the same name, but a different number or neutrons.
If you change the neutrons, you must change the mass #. This
answer changed nothing.
CORRECT!
If you add a neutron, you create an isotope. An isotope is an
element of the same name, but a different number or neutrons. If
you change the neutrons, you must change the mass #
WHICH #’S ARE CORRECT FOR
CARBON – 13?
Atomic # = 13
Mass # = 6
Protons = 13
Electrons = 7
Neutrons = 13
Atomic # = 6
Mass # = 13
Protons = 6
Electrons = 6
Neutrons = 7
Atomic # = 7
Mass # = 6
Protons = 7
Electrons = 6
Neutrons = 13
INCORRECT…TRY AGAIN.
Remember:
Atomic # = number of protons, the element on the periodic
table
Mass # = protons + neutrons
Protons = identifies the atom on the periodic table
Electrons = the # of protons in a neutral atom
Neutrons = mass # - atomic #
CORRECT!
carbon – 13
Atomic # = 6
Mass # = 13
Protons = 6
Electrons = 6
Neutrons = 7
WHAT DID BOHR CONCLUDE ABOUT
THE ATOM?
The atom contains negatively charged particles
in a sea of positive matter
Electrons orbit the nucleus in energy levels
Atoms are indivisible
INCORRECT…TRY AGAIN.
The atom contains negatively charged particles
in a sea of positive matter
* This was stated by Thomson
INCORRECT…TRY AGAIN.
Atoms are indivisible
* This was stated by Dalton
CORRECT!
Electrons orbit the nucleus in energy levels
WHICH OF THE FOLLOWING IS NOT AN
ELEMENT?
Neon
Oxygen
Water
INCORRECT…TRY AGAIN.
To be an element, it must be on the periodic
table.
Neon is on the periodic table so it IS an element.
INCORRECT…TRY AGAIN.
To be an element, it must be on the periodic
table.
Oxygen is on the periodic table so it IS an
element.
CORRECT!
Water is a compound. It is not found on the
periodic table. To be an element, it must be
listed on the periodic table.
WHAT DID J.J. THOMSON SAY ABOUT
THE ATOM?
The atom contains negatively charged particles
in a sea of positive matter
The atom is a void of empty space
The atom has a dense, small, positive mass in the
center
INCORRECT…TRY AGAIN.
The atom is a void of empty space
* This was stated by Democritus
INCORRECT…TRY AGAIN.
The atom has a dense, small, positive mass in
the center
* This was stated by Rutherford
CORRECT!
The atom contains negatively charged particles
in a sea of positive matter
DALTON’S MODEL WAS KNOWN AS
THE ___________________.
Cookie Dough Model
Planetary Model
Billiard Ball Model
INCORRECT…TRY AGAIN.
Cookie Dough Model:
The atom contains negatively charged particles
in a sea of positive matter
* This was stated by Thomson
INCORRECT…TRY AGAIN.
Planetary Model:
Electrons travel in orbitals (energy levels)
around the nucleus
* This was stated by Bohr
CORRECT!
Billiard Ball – the atom was indivisible
YOU HAVE FINISHED THE REVIEW
•Good Luck on your Quiz!