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Atomic Theory & Nuclear Chemistry
Atomic Theory & Nuclear Chemistry
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Atomic Theory, Nuclear Chemistry and space science
Flashcards
35 cards
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Questions
35
Answers
1
An isotope has a half-life of 2 days. How much of 40 g is left after 4 days?
5 g
10 g
20 g
40 g
2
What type of radiation is emitted here (besides gamma)?
positron
alpha
beta
neutron
3
Which of the following did Dalton discover?
he didn't know about protons, neutrons or electrons
neutrons
protons
electrons
4
What does a beta particle seem to be?
an electron
a neutron
electricity
a proton
5
Aluminum-26 and aluminum-27 are isotopes of each other.
True
True only if they have different numbers of protons
False
True on Chapel day only.
6
How many protons does this isotope have?
36
48
it is impossible to tell
84
7
What type of nuclear radiation is this a symbol of:
beta
gamma
zeta
alpha
8
If you add up the number of protons and neutrons, what is the sum called?
atomic mass
average atomic mass
mass number
nothing
9
What happens in nuclear fission reactions?
large atoms split apart
small atoms split apart
large atoms combine
small atoms combine
10
Why do some isotopes emit radiation?
they have nothing else to do
humans are always messing with them
it makes them less stable
it makes them more stable
11
What is the charge of a proton?
neutral
positive
there is no such thing as protons
negative
12
If the mass number of a chlorine (Cl) atom is 37, how many neutrons does it have?
17
20
37
0
13
What famous experiment led to the discovery of the nucleus?
metal foil
alpha particles
gold foil
yellow foil
14
What types of radiation may be emitted by a radioactive isotope?
beta radiation
gamma radiation
alpha radiation
any of these
15
What is the mass number of iodine if it has 53 protons and 74 neutrons?
127
53
74
21
16
Who discovered electrons?
Thomson
Rutherford
Democritus
Dalton
17
What event marks the death of any star?
nuclear fission stops
supernova explosion
nuclear fusion stops
gravitational collapse
18
What type of nuclear radiation is being given off here:
helium
gamma
beta
alpha
19
Which type of nuclear reaction happens in the core of a main-sequence star?
fusion of hydrogen into helium
fission of helium into hydrogen
fusion of helium into carbon
fission of carbon into helium
20
Aluminum-26 and aluminum-27 always have the same
number of protons
mass number
price
number of neutrons
21
Who was the first scientist with experimental evidence for the existence of atoms?
Democritus
Dalton
Thomson
Rutherford
22
Which philosopher first provided us with the term that developed into "atom"?
Aristotle
Democritus
Socrates
Atomos
23
What is the charge of an electron?
negative
there are no such things as electrons
positive
neutral
24
What is the name for the dense, positively charged central region in an atom?
neutron star
positivity
mitochondria
nucleus
25
How many electrons does mercury (Hg) have (provided it is neutral)?
78
12
200.6
80
26
Who discovered the nucleus?
Dalton
Thomson
No one--no such thing
Rutherford
27
What are the neutrally charged particles called located in the nucleus of an atom?
neutrals
nuclears
neutrons
nucleonides
28
What is the atomic number of lithium (Li)?
3
6
6.94
it doesn't have one
29
What happens in fusion reactions?
atoms of small mass combine
energy is emitted
atoms of large mass split apart
chemical reactions occur
30
How did Democritus support his theory of atoms?
revelation by an angel
he didn't--no one believed him
scientific evidence
logical reasoning
31
How many protons does bromine (Br) have?
it doesn't have any protons
35
17
79.9
32
What is the half-life of a radioactive isotope?
the time it takes to grow by half
the time it takes to shrink by half
half the time it takes to decay
it is the same for all isotopes
33
A protostar becomes a main sequence star when what occurs?
supernova
nuclear fission
nuclear fusion
gravitational collapse
34
How many neutrons does this isotope have?
84
48
0
36
35
How do all stars begin their life cycle?
nebula
red giant
supernova
black hole
