Atoms HW
Page 1 of 7
Name: ____________________________________
1.
6.
What was concluded about the structure of the atom as the
result of the gold foil experiment?
Which pair must represent atoms of the same element?
1. A positively charged nucleus is surrounded by
positively charged particles.
2. A positively charged nucleus is surrounded by mostly
empty space.
3. A negatively charged nucleus is surrounded by
positively charged particles.
4. A negatively charged nucleus is surrounded by mostly
empty space.
1.
and
2.
and
3.
4.
and
and
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-------------7.
2.
What is the total number of neutrons in an atom of
1. 26
2. 31
?
3. 57
4. 83
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Which of the following is a not a correct electron
configuration for an atom of aluminum-27 in an excited
state?
1. 2-7-4
2. 1-8-4
3. 2-7-3-1
4. 2-8-3
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3.
An atom is electrically neutral because the
1. number of protons equals the number of electrons
2. number of protons equals the number of neutrons
3. ratio of the number of neutrons to the number of
electrons is 1:1
4. ratio of the number of neutrons to the number of
protons is 2:1
8.
Which of the following is a correct electron configuration for
an atom of aluminum-27 in an excited state?
1. 2-8-3
2. 2-8-4
3. 2-7-4
4. 2-7-5
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-------------9.
4.
Which electron configuration could represent a strontium
atom in an excited state?
1. 2-8-18-7-1 3. 2-8-18-8-1
2. 2-8-18-7-3 4. 2-8-18-8-2
-------------5.
Which two particles have opposite charges?
1. an electron and a neutron
2. an electron and a proton
Which statement describes how an atom in the ground state
becomes excited?
1. The atom absorbs energy, and one or more electrons
move to a higher electron shell.
2. The atom absorbs energy, and one or more electrons
move to a lower electron shell.
3. The atom releases energy, and one or more electrons
move to a higher electron shell.
4. The atom releases energy, and one or more electrons
move to a lower electron shell.
3. a proton and a neutron
4. a proton and a positron
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Atoms HW
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10.
16.
An electron in a sodium atom moves from the third shell to Each diagram below represents the nucleus of a different atom.
the fourth shell. This change is a result of the atom:
1. absorbing energy
2. releasing energy
3. gaining an electron
4. losing an electron
-------------Which diagrams represent nuclei of the same element?
11.
1.
2.
3.
4.
The gold foil experiment led to the conclusion that each
atom in the foil was composed mostly of empty space
because most alpha particles directed at the foil
1.
2.
3.
4.
passed through the foil
remained trapped in the foil
were deflected by the nuclei in gold atoms
were deflected by the electrons in gold atoms
--------------
12.
The light emitted from a flame is produced when electrons
in an excited state
1.
2.
3.
4.
D and E, only
D, E, and Q
Q and R, only
Q, R, and E
--------------
17.
Which subatomic particles are located in the nucleus of a
carbon atom?
1. protons, only
2. neutrons, only
3. protons and neutrons
4. protons and electrons
--------------
absorb energy as they move to lower energy states
absorb energy as they move to higher energy states 18.
release energy as they move to lower energy states
release energy as they move to higher energy states Which element has an atom in the ground state with a total of
three valence electrons?
--------------
13.
What is the total number of protons in an atom with the
electron configuration 2-8-18-32-18-1?
1. 69 3. 118
2. 79 4. 197
-------------14.
In a calcium atom in the ground state, the electrons that
possess the least amount of energy are located in the
1. first electron shell
3. third electron shell
2. second electron shell 4. fourth electron shell
1. aluminum
2. lithium
3. phosphorus
4. scandium
--------------
19.
What is the total charge of the nucleus of a nitrogen atom?
1. +5
2. +2
3. +7
4. +14
--------------
20.
-------------Which electron configuration represents an excited state for a
potassium atom?
15.
An atom in the ground state has seven valence electrons.
This atom could be an atom of which element?
1. calcium 3. oxygen
2. fluorine 4. sodium
1. 2-8-7-1
2. 2-8-7-2
3. 2-8-8-1
4. 2-8-8-2
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Atoms HW
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Atoms HW
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21.
Which statement identifies the element arsenic?
1. Arsenic has an atomic number of 33.
2. Arsenic has a melting point of 84 K.
3. An atom of arsenic in the ground state has eight valence electrons.
4. An atom of arsenic in the ground state has a radius of 146 pm.
-------------22.
The mass of a proton is approximately equal to the mass of
1. an alpha particle
2. an electron
3. a neutron
4. a positron
--------------
23.
What is the total charge of the nucleus of a carbon atom?
1. −6
2. 0
3. +6
4. +12
--------------
24.
Which electron configuration represents an atom in an excited state?
1. 2–7
2. 2–6–2
3. 2–8–1
4. 2–8–8–2
--------------
25.
The total mass of the protons in an atom of gold-198 is approximately
1. 79 atomic mass units
3. 198 atomic mass units
2. 119 atomic mass units 4. 277 atomic mass units
-------------26.
Which quantity identifies an element?
1.
2.
3.
4.
atomic number
mass number
total number of neutrons in an atom of the element
total number of valence electrons in an atom of the element
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Atoms HW
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27.
The total number of protons, electrons, and neutrons in each of four different atoms are shown in the table below.
Which two atoms are isotopes of the same element?
1. A and D
2. A and Z
3. X and D
4. X and Z
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28.
Given the bright-line spectra of three elements and the spectrum of a mixture formed from at least two of these elements:
Which elements are present in this mixture?
1.
2.
3.
4.
E and D, only
E and G, only
D and G, only
D, E, and G
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