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Duplicate of Chapter 3 Test Review - Chemical Foundations: Elements, Atoms, and Ions Flashcards | StudBud
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Duplicate of Chapter 3 Test Review - Chemical Foundations: Elements, Atoms, and Ions
Duplicate of Chapter 3 Test Review - Chemical Foundations: Elements, Atoms, and Ions
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#elements #atoms #ions
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Answers
1
How many electrons are present in a fluorine, F, atom?
10
11
9
18
2
Classify the following as a metal, nonmetal, or metalloid - argon.
nonmetal
metalloid
metal
3
In chemistry, a formula is used to represent
a metal
all of these
an element
a compound
4
The atom with 68 neutrons and 50 protons has a mass number of
118
68
50
18
5
Classify the following as a metal, nonmetal, or metalloid - arsenic.
nonmetal
metalloid
metal
6
Which of the following elements is an alkaline earth metal?
Cu
Na
Ca
Fe
7
The symbol for the element cobalt is
Cb
Co
Cu
C
8
What is the most abundant element found in the human body?
carbon
oxygen
calcium
hydrogen
9
Choose the pair in which the components have the same charge.
a neutron and a hydrogen atom
a hydrogen atom and an electron
a proton and a hydrogen atom
an electron and a neutron
10
Classify the following as a metal, nonmetal, or metalloid - plutonium.
metal
nonmetal
metalloid
11
The first scientist to show that atoms emit tiny negative particles was
J. J. Thomson
Ernest Rutherford
Lord Kelvin
William Thomson
12
The mass number of an atom equals
the number of protons plus the number of neutrons per atom
the atomic mass of the element
the number of neutrons per atom
the atomic number of the element
13
How many protons are in the nucleus of a Mg atom?
25
36
24
12
14
Classify the following as a metal, nonmetal, or metalloid - calcium.
metalloid
metal
nonmetal
15
Choose the correct statement.
Metals make + cations and nonmetals make negative anions
Metals make + anions and nonmetals make negative cations
Metals make negative cations and nonmetals make + anions
Metals make negative anions and nonmetals make + cations.
16
Which of the following is a nonmetal?
carbon
cesium
calcium
cerium
17
How many electrons are present in a bromine atom with a mass number of 87?
87
35
80
122
18
The number of protons in the nucleus of an atom is called its
isotope number
valence
mass number
atomic number
19
Which of the following is a noble gas?
H2
N2
O2
Ar
20
Which atomic particle determines the chemical behavior of an atom?
electron
proton
neutron
nucleus
21
How many protons, electrons, and neutrons, respectively, does an aluminum ion have?
13, 13, 27
13, 10, 14
13, 13, 14
13, 10, 27
22
A substance composed of 2 or more elements combined chemically in a fixed proportion by mass is
a mixture
a compound
a solid
an atom
23
Mendeleev is credited with the modern atomic theory of atoms.
False
True
24
The avg atomic mass of N is 14.0067amu. Predict which isotope is most abundant in nature?
nitrogen-13
nitrogen-14
nitrogen-15
25
Which particle has the smallest mass?
helium nucleus
proton
electron
neutron
26
An atom with 45 protons has a mass number of 100. It must contain how many neutrons?
100
55
145
45
27
An atom with 15 protons and 16 neutrons is an atom of
P
Pd
S
Ga
28
How many protons, electrons, and neutrons, respectively, does oxygen-16 have?
8, 8, 8
8, 10, 8
8, 14, 8
8, 18, 8
29
What is the most abundant element on the earth (including the crust, oceans, and atmosphere)?
hydrogen
silicon
carbon
oxygen
30
Nitrogen-15 and oxygen-15 are isotopes.
False
True
31
The symbol for the element potassium is
Po
K
P
Pt
32
The fundamental "particle" of a chemical element according to Dalton's theory is the
molecule
compound
electron
atom
33
How many atoms are represented by one formula unit of aluminum dichromate, Al
2
(Cr
2
O
7
)
3
?
14
25
29
27
34
How many protons, electrons and neutrons respectively does iodine-127 have?
53, 53, 127
53, 74, 53
53, 53, 74
53, 127, 74
35
What is the charge on an ion with 21 protons, 25 neutrons, and 18 electrons
4+
3-
3+
4-
36
The symbol for the element chlorine is
C o
C
Cl
Ch
37
The chemical formula Al
2
O
3
indicates
three atoms of aluminum and two atoms of oxygen
two atoms of aluminum and three atoms of oxygen
six atoms of each element
five atoms of each element
38
Which of these are isotopes of hydrogen?
potassium-42 and potassium-40
carbon-12 and carbon-13
hydrogen-3 and hydrogen-2
hydrogen-2 and helium
39
How many electrons are present in a tin atom with a mass number of 119?
69
169
119
50
40
Which of the following elements is most similar to chlorine?
Na
Br
He
Hg
41
An atom with 46 protons has a mass number of 102. The atom is
U
Pd
Ba
No
42
How many hydrogen atoms are indicated in the formula (NH
4
)
2
C
8
H
4
O
2
?
8
20
24
12
43
Atoms of the same element having the same atomic number but different mass numbers are called
neutrons
isomers
orbitals
isotopes
44
Which of the following elements is an alkali metal?
Cu
Na
Fe
Ca
45
Scientist whose alpha-particle scattering experiment = nucleus of atom contains dense + charge
Ernest Rutherford
William Thomson
Lord Kelvin
J.J. Thomson
