Download atom unit review key 10

Review Question #1
Place the following in order and match them to their
discovery or idea.
1. Gell-Mann(h)
2. Chadwick (g)
3. Schrodinger(f)
4. Bohr(e)
5. Rutherford(d)
6. Thomson(c)
7. Dalton(b)
8. Democritus(a)
a) named and defined the atom
b) atomic theory
c) electron
d) positive nucleus (proton)
e) energy levels
f) electron cloud model
g) neutron
h) quarks
Review Question #2
List the number of protons, neutrons, and electrons
for the following elements:
Mercury:
p+ 80
no 121
e- 80
Arsenic:
p+ 33
no 42
e- 33
Aluminum +3 ion: p+ 13
no 14
e- 10
Review Question #3
Look at the following atom pairs. Label atom B as an
ion, isotope, or different element.
1. Atom A: 10 protons, 10 neutrons, 10 electrons
Atom B: 10 protons, 11 neutrons, 10 electrons
isotopes
2. Atom A: 9 protons, 10 neutrons, 10 electrons
Atom B: 9 protons, 10 neutrons, 9 electrons
ions
3. Atom A: 28 protons, 31 neutrons, 28 electrons
Atom B: 2 protons, 2 neutrons, 2 electrons
dif. elements
4. Atom A: 6 protons, 6 neutrons, 6 electrons
Atom B: 6 protons, 6 neutrons, 8 electrons
ions
Review Question #4
Draw the Bohr model for each of the following atoms:
Calcium
20 e-
Chlorine
17 e-
Review Question #5
Draw the Bohr model for each of the following atoms:
Titanium +2 ion
20e-
Nitrogen -3 ion
10e-
Review Question #6
Compare the masses of the proton, electron, and
neutron. State your answers in atomic mass units or
grams.
Proton:
1 amu
Electron:
0 amu
Neutron:
1 amu
Review Question #7
Carbon-14 dating is a way of determining the age of
certain archeological artifacts of a biological origin
up to about 50,000 years old. It is used in dating
things such as bone, cloth, wood and plant fibers.
How is Carbon-14 different from all other isotopes of
carbon?
Carbon-14 has a different number of neutrons
than all other isotopes of Carbon. This gives
Carbon-14 a different mass number than all other
isotopes of Carbon.
Review Question #8
Two electrons decide to see how far they can jump.
The first electron jumps eight nanometers, the next
one jumps eighteen nanometers. The winner gets to
spend thirty-two days in the nucleus.
What is the significance of this story to what we
learned in chapter 4?
It’s a way to memorize the number of
electrons allowed in the energy levels.
2 – 8 – 18 - 32
Review Question #9
What two parts of Dalton’s atomic theory were
incorrect? Why?
Dalton’s theory that all atoms are indivisible
and that atoms of the same element have the same
mass was incorrect.
Subatomic particles were discovered and elements
are made of isotopes.
Review Question #10
What is indirect evidence? How did it help humans
figure out the secrets of the atom?
Indirect evidence is evidence one gathers
without using the sense of sight.
This helped humans figure out the secrets of the
atom because atoms are too small to be seen.
Review Question #11
Compare the mass and volume of the nucleus to the
total mass and volume of the atom.
The mass of the nucleus is equal to the mass
of the atom because it contains the protons and
neutrons which are by far the heaviest particles in
the atom.
The volume of the nucleus is VERY small compared
to the volume of the atom.
Review Question #12
What is the difference between the atomic mass and
the atomic number?
Atomic mass: average mass of all existing isotopes
as they occur in nature.
Atomic number: Number of protons in the nucleus.
Review Question #13
The atomic number of Magnesium is 12 and
its atomic mass is 24. How many protons,
neutrons, and electrons are in an atom of
Mg?
The atomic number assures us that there are
12 protons. Since it is a neutral atom, it also
must have 12 electrons. With a mass of
24 amu, that means the remaining mass
comes from its 12 neutrons.
Review Question #14
“Explain the punch-line”
Schröedinger stated that the electron
is a particle and a wave.