Download Identify the letter of the choice that best completes

Name: _______________________________________
Atomic Structure
Identify the letter of the choice that best completes the statement or answers the
question.
1) An atom is
a. an artificially assembled unit that contains protons and electrons
b. a tiny, indivisible particle
c. the smallest piece of mass
d. the smallest particle of an element that retains the chemical identity of that
element
2) Rutherford conducted an investigation where particles were fired at gold atoms. Some of
the particles went through the gold and some bounced directly back or at angles. What
did this observation confirm about the structure of an atom?
a. Atoms are mostly empty space.
b. Atoms are totally solid and let nothing pass through.
c. Atoms have electrons in their structures.
d. Neutrons are in the nucleus.
3) Which particles of an atom hold a charge?
a. protons and neutrons
b. only the nucleus
c. protons and electrons
d. protons, electrons, and neutrons
4) A particle that has the same mass as a proton is a(n)
a. neutron
b. electron
c. alpha particle
d. beta particle
5) Adding a neutron to the nucleus of an atom
a. decreases the mass of the atom and decreases the charge
b. decreases the mass of the atom but increases the charge
c. increases the mass of the atom but has no effect on the charge
d. increases the mass of the atom and also increases its charge
6) An isotope of the same element has different
a. chemical properties
b. mass numbers and atomic numbers
c. numbers of protons and numbers of neutrons
d. mass numbers and numbers of neutrons
7) Carbon-14 has more ___________than carbon-12.
a. neutrons
b. protons
c. neutrons and electrons
d. electrons and protons
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Name: _______________________________________
Atomic Structure
8) The atomic mass of an element is determined from the number of
a. protons
b. electrons and protons
c. neutrons
d. protons and neutrons
9) Reference the periodic table. A neutral atom of silicon (Si) contains
a. 28 electrons
b. 14 electrons
c. 28.09 electrons
d. 42 electrons
10) A neutral atom changes to a charge of +3 by
a. gaining 3 electrons
b. gaining 3 protons
c. losing 3 electrons
d. losing 3 protons
11) The atomic number for aluminum from the periodic table is
a. 13
b. 14
c. 26.98
d. 26.9815
12) An atom with 15 protons, 16 neutrons, and 15 electrons would have an atomic number of
a. 15
b. 46
c. 31
d. 16
13) Argon, with atomic number 18 and mass number 40, has ___ protons in the nucleus.
a. 9
b. 22
c. 40
d. 18
14) Argon, with atomic number 18 and mass number 40, has ___ neutrons in the nucleus.
a. 9
b. 22
c. 40
d. 18
15) Based on the atomic model scientists have determined that electrons
a. are electrically neutral
b. move in the space around the nucleus
c. have a mass equal to the mass of protons
d. are in the nucleus
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Name: _______________________________________
Atomic Structure
16) What will happen if two electrons are brought close to one another?
a. They destroy one another.
b. They repel one another.
c. They attract one another.
d. Nothing will happen.
17) What will happen if a proton and electron are brought close to one another?
a. They destroy one another.
b. They repel one another.
c. They attract one another.
d. Nothing will happen.
18) What will happen if a proton and neutron are brought close to one another?
a. They destroy one another.
b. They repel one another.
c. They attract one another.
d. Nothing will happen.
19) An isotope of an atom has the same number of _________ but different number of
___________.
a.
Protons; electrons
b.
Neutrons; electrons
c.
Protons; neutrons
d.
Electrons; protons
20) Which of the following particles has the smallest effect on the atomic mass?
a.
number of protons
b.
number of electrons
c.
number of neutrons
d.
number of protons and neutrons
21) Complete the following table based on your Periodic Table and the info provided:
Symbol
35
17
Cl-1
87
Sr+2
__
18
43
Ar
Atomic
Number
Number of
Protons
Number of
Electrons
38
Number
of
Neutrons
Atomic
Mass
49
18
40
Ar
3
Name: _______________________________________
Atomic Structure
22) In the box shown, draw a Bohr Model of the element Francium (F). In this model,
including the following information:
 a nucleus
 correct # of protons and their location.
 correct # of neutrons and their location.
 correct # electrons and their location.
23) Calculate the weighted average mass of the element Copper (Cu) knowing 63Cu is 69%
abundant and 65Cu is 31% abundant. Copying the mass from the Periodic Table will
not be accepted. The calculation must support the answer.
Weighted average mass of Cu = _____________amu.
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