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