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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
average atomic mass
B
atomic number
C
ionic charge
D
mass number
2) An atom of Carbon gains 1 proton and loses 1 neutron. Is it still a Carbon Atom?
A
It depends on the amount of electrons
B
It depends on the amount of electrons
C
Yes
D
No
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
Yes
D
It depends on the amount of electrons
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
neutral atom
B
negative ion
C
positive ion
D
anion
5) _______________________________are atoms of the same element that have different numbers of neutrons. Most elements have several of these.
A
Ions
B
Valence atoms
C
Allotropes
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 Electrons + # of Neutrons = Mass #
D
# of Protons + # 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
Atomic Number
B
Average 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
radioactive
D
absolutely deadly to humans
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
Radioactive Decay
B
Nuclear Decay
C
Isotropic Decay
D
None of These
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
None of These
D
1 proton and 1 neutron
11) In beta decay, a neutron in an atom changes into a proton and ____________________ called a beta particle.
A
a high energy proton is released
B
a neutral particle is released
C
a high energy neutron is released
D
a high energy electron is released
12) Gamma rays do not contain ____________, but they do contain a lot of energy.
A
ions
B
radiation
C
isotopes
D
particles
13) All 3 types of nuclear decay begin with a(n) __________________.
A
stable nucleus
B
unstable nucleus
C
positron
D
ionic charge
14) The process of nuclear decay always results in the original atom changing into a different element.
A
It depends on the amount of electrons
B
False - Beta and Gamma decay change the element, but Alpha does not.
C
True
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
isotope
C
metalloid
D
ion
16) An atom with a positive charge is called a ________________________________or______________________________.
A
positive ion / anion
B
negative ion / anion
C
negative ion / cation
D
positive ion/ cation
17) An atom with a negative charge is called a ________________________________________or _________________________________________.
A
negative ion / cation
B
negative ion / anion
C
positive ion / anion
D
positive ion/ cation
18) An atom has: 8 Protons , 8 Neutrons, and 9 Electrons. Does this atom carry an electrical charge?
A
Yes - It has a negative charge
B
Yes - It has a positive 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
25
B
9
C
17
D
16
20) An atom has a mass number of 19, 11 protons, and 10 electrons. How many neutrons are present in the nucleus?
A
10
B
21
C
9
D
8
*select an answer for all questions
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