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Unit 02 - Atomic Theory and Isotopes Flashcards | StudBud
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Unit 02 - Atomic Theory and Isotopes
Unit 02 - Atomic Theory and Isotopes
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review atomic theory and structure
Flashcards
17 cards
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Questions
17
Answers
1
All atoms of the same element have the same
nuclear mass
number of protons
number of neutrons
mass numbers
2
What is the relative charge carried by an electron?
positive
+1
-1
negative
3
Which of the following is necessary to calculate the atomic mass of an element?
the atomic mass of carbon-12
the relative masses of the element’s protons and neutrons
the masses of each isotope of the element
the atomic number of the element
4
Isotopes of the same element have different
number of electrons
atomic numbers
chemical properties
number of neutrons
5
A positively charged subatomic particle
proton
neutron
gluon
electron
6
Which of the following is NOT a part of Dalton's atomic theory?
All elements are composed of atoms.
Atoms that combine do so in simple whole-number ratios.
Atoms are always in motion.
Atoms of the same element are identical.
7
How do the isotopes protium and deuterium differ?
deuterium has one more neutron
deuterium has one more proton
protium has one more neutron
protium has one more proton
8
The weighted average of the masses of the isotopes of an element
atomic number
atomic mass unit
mass number
atomic mass
9
How many protons are present in an atom of Strontium?
38
87.62
2
Sr
10
What does the number 12 in the name carbon-12 represent?
the atomic mass
the atomic number
the number of neutrons
the mass number
11
Using the periodic table, determine the number of neutrons in Uranium-233
233
U
92
141
12
What is the mass number for an oxygen atom that has 7 neutrons in its nucleus?
15.9994
7
8
15
13
All atoms are
neutral, with all electrons equaling protons
neutral, with all neutrons equally protons
positive, with electrons equaling protons
negative, with all neutrons equally protons
14
Dalton though atoms are indivisible and all atoms of an element are identical. It is now known
all atoms of an element must have the same mass
atoms of an element can have different numbers of protons
all of Dalton's hypotheses are correct
atoms are divisible
15
The central part of an atom, containing protons and neutrons
electrons
kernel
nucleus
electron cloud
16
Cl has two isotopes, Cl-35 and Cl-37. The atomic mass of Cl is 35.45. Which is more abundant?
35
37
17
35.45
17
The smallest particle of an element that retains the properties of that element is a(n)
nucleus
atom
molecule
quark
