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Composition And Properties Of Matter (Part 2)
Test Description: Composition and Properties of Matter (Part 2)
Instructions: Answer all questions to get your test result.
1) The number of protons in an atom of an element is the element’s____________________________________. It is the whole number listed with each element on the periodic table.
A
atomic number
B
average atomic mass
C
mass number
D
ionic charge
2) An atom of Carbon gains 1 proton and loses 1 neutron. Is it still a Carbon Atom?
A
No
B
It depends on the amount of electrons
C
It depends on the amount of electrons
D
Yes
3) A Carbon atom gains 1 neutron and loses 1 electron. Is it still a Carbon atom?
A
It depends on the amount of electrons
B
No
C
It depends on the amount of electrons
D
Yes
4) In a___________________________________, the number of electrons equals the number of protons. Thus, the number of positive charges equals the number of negative charges.
A
anion
B
negative ion
C
positive ion
D
neutral atom
5) _______________________________are atoms of the same element that have different numbers of neutrons. Most elements have several of these.
A
Ions
B
Allotropes
C
Valence atoms
D
Isotopes
6) The mass number of an atom can be calculated by which of the following equations:
A
# of Protons + # of Electrons = Mass #
B
# of Protons - # of Electrons = Mass #
C
# of Protons + # of Neutrons = Mass #
D
# of Electrons + # of Neutrons = Mass #
7) __________________________________of an element is the average mass of the element’s isotopes, weighted according to the abundance of each isotope.
A
Average Atomic Number
B
Atomic Number
C
Average Atomic Mass
D
Mass Number
8) Elements that spontaneously emit radiation are considered to be ____________________________.
A
always safe for humans to be exposed to
B
ionic
C
absolutely deadly to humans
D
radioactive
9) Elements that are radioactive contain unstable nuclei. ______________________________is a process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation.
A
Nuclear Decay
B
Radioactive Decay
C
None of These
D
Isotropic Decay
10) Alpha Decay: An alpha particle is made of __________________. When an atom releases an alpha particle, its atomic number decreases by two. Uranium-238 decays to thorium-234 through the process.
A
1 high energy electron
B
2 protons and 2 neutrons
C
1 proton and 1 neutron
D
None of These
11) In beta decay, a neutron in an atom changes into a proton and ____________________ called a beta particle.
A
a neutral particle is released
B
a high energy electron is released
C
a high energy neutron is released
D
a high energy proton is released
12) Gamma rays do not contain ____________, but they do contain a lot of energy.
A
isotopes
B
radiation
C
particles
D
ions
13) All 3 types of nuclear decay begin with a(n) __________________.
A
ionic charge
B
stable nucleus
C
unstable nucleus
D
positron
14) The process of nuclear decay always results in the original atom changing into a different element.
A
True
B
False - Beta and Gamma decay change the element, but Alpha does not.
C
It depends on the amount of electrons
D
False - Alpha and Beta decay change the element, but Gamma decay does not.
15) A(n) ________________________________is an atom that is no longer neutral because it has gained or lost electrons. An ion can be positively or negatively charged, depending on whether it has lost or gained electrons.
A
neutral atom
B
metalloid
C
isotope
D
ion
16) An atom with a positive charge is called a ________________________________or______________________________.
A
negative ion / anion
B
negative ion / cation
C
positive ion / anion
D
positive ion/ cation
17) An atom with a negative charge is called a ________________________________________or _________________________________________.
A
positive ion / anion
B
positive ion/ cation
C
negative ion / cation
D
negative ion / anion
18) An atom has: 8 Protons , 8 Neutrons, and 9 Electrons. Does this atom carry an electrical charge?
A
Yes - It has a positive charge
B
Yes - It has a negative charge
C
Not enough information provided to answer the question
D
No - It has an equal amount of protons and neutrons
19) An atom has: 8 Protons , 8 Neutrons, and 9 Electrons. What is its mass number?
A
9
B
16
C
25
D
17
20) An atom has a mass number of 19, 11 protons, and 10 electrons. How many neutrons are present in the nucleus?
A
9
B
10
C
8
D
21
*select an answer for all questions
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