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Ch 4 Review
Ch 4 Review
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Atomic Theory and Isoptopes
Flashcards
28 cards
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Practice quiz
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Questions
28
Answers
1
An element has an atomic number 78. The number of protons and electrons in a neutral atom are?
78 and 78
78 and 0
39 and 39
156 and 78
2
Dalton's Atomic Theory included which idea?
all atoms of an element are the same size
atoms of differnet elements combine in 1:1 ratio
individual atoms can be seen with a microscope
atoms of the same element are always identical
3
The number of protons in the nucleus of an atom?
mass number
atomic mass unit
atomic number
atomic mass
4
Which originally was an idea of Dalton that was later corrected?
Atoms are tiny indivisible particles
Compounds are made by combining atoms
Atoms combine with other atoms in whole number ratios
Atoms of the same element are identical
5
Which of the following is not true?
the nucleus of an atom has a positive charge
atoms are mostly empty space
atoms of the same elements can have different masses
atoms of isotopes on an element have diff. # of protons
6
Isotopes of the same element have different _____
number of neutrons
number of electrons
number of protons
atomic numbers
7
Sulfur forms a -2 charge. How many protons, electrons and neutrons in a sulfur ion?
32, 32, 16
16, 18, 16
18, 18, 32
16, 16, 18
8
Atoms with the same number of protons, but different numbers of neutrons in the nucleus?
atomic mass unit
isotope
mass number
atomic number
9
What does the number '37' in chlorine-37 represent?
atomic number
the mass number
twice the number of protons
the sum of the protons and electrons
10
The scientist who discovered the nucleus?
Rutherford
Goldstein
Thomson
Democritus
11
The total number of protons and neutrons in the nucleus of an atom?
mass number
atomic mass
isotope
atomic number
12
1/12th the mass of a carbon -12 atom???
atomic mass unit
mass number
atomic mass
atomic number
13
Why do chemists use relative masses of atoms rather than actual masses of the atoms?
Actual masses very small and difficult to work with
Actual mass of electron very large compared to mass ofproton
# of subatomic particles in atoms of diff. elements varies
Actual masses of protons, electrons and neutrons unknown
14
In which of the following examples are correctly written?
Cs, 55 protons, 132.9 electrons
In, 49 protons, 49 electrons
F, 19 protons, 19 electrons
Zn, 30 protons, 60 electrons
15
Carbon has 2 isotopes: C-12 (98.9%) and C-13 (1.10%) Calculate average atomic mass.
12.5 amu
12.0108 amu
12.011 amu
none of these amu
16
The atomic mass of an element is the
weighted avg of the masses of all known isotopes
total mass of all isotopes
total number of subatomic particles in nucleus
avg. of the mass # and the atomic # for the element
17
How many protons, electrons and neutrons does an atom with At. # 50 and mass # 125 contain?
125, 50, 75
50, 50, 75
75, 50, 50
50, 75, 50
18
The element barium has how many protons, electrons and neutrons
56, 56, 137
81, 81, 137
56, 56, 81
56, 81, 56
19
All atoms of the same element have the same
number of protons
number of neutrons
mass
mass numbers
20
The weighted average of the masses of the isotopes of an element?
mass number
atomic number
atomic mass
atomic mass unit
21
Relative atomic masses are measured in
nanograms
grams
angstroms
amu's
22
How many neutrons are in an atom of indium (49)
65
115
49
66
23
Which of the following is true about subatomic particles?
electrons are negatively charged and are the heaviest subatomic particle
protons are positively charged and the lightest subatomic particle
neutrons have no charge and are the lightest subatomic particle
the mass of a neutrons nearly equals the mass of a proton
24
Which of the following equals one atomic mass unit?
the mass of one helium-4 atoms
one-twelfth the mass of of one carbon-12 atom
the mass of one carbon-12 atom
the mass of one electron
25
Which of the following is not true?
Nucleus is positively charged
Electrons negatively charged and have mass of 1 amu
neutrons are located in the nucleus of an atom
protons have a positive charge
26
The atomic number of an element is the total number of which particles in the nucleus?
neutrons
protons
protons and electrons
electrons
27
Using the PT, determine the number of neutrons in oxygen -18.
8
18
16
10
28
All atoms are ___
neutral, with the # of protons equaling the # of neutrons
neutral, with the # of protons equaling the # of electrons
negatively charged, w/the # of electrons exceeding the # protons
positively charge, w/ the # of protons exceeding the # of electrons
