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Atomic Theory
Atomic Theory
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atomic theory
Flashcards
69 cards
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Questions
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Answers
1
I revived Democritus atomic theory! I am...
Ice T
Tom Brady
John Dalton
Neils Bohr
2
Isotopes of atoms that never fall apart are...
isotopes
unstable
ions
stable
3
Use the periodic table. What is the atomic number of
207
Pb with 125 neutrons?
125
207
84
82
4
Cations are ____.
positive ions formed by gaining electrons
negative ions formed by losing electrons
negative ions formed by gaining electrons
positive ions formed by losing electrons
5
What is the meaning of the top left number?
# Protons
# Electrons
# Mass
# Neutrons
6
Anions are ____.
negative ions formed by losing electrons
positive ions formed by losing electrons
negative ions formed by gaining electrons
positive ions formed by gaining electrons
7
The Bohr model shows:
All of the valence electrons only
All of the atom's electrons in orbits
All of the atom's protons in orbits
All of the neutrons in orbits
8
Mass number can be calculated by ____.
subtracting atomic number and neutrons
adding protons and electrons
adding protons and neutrons
subtracting atomic number and protons
9
Electrons were discovered by _______.
John Dalton
JJ Thomson
Ernest Rutherford
James Chadwick
10
Unstable isotopes are referred to as
radiogenic
radiosourced
radiosatellite
unstable!
11
Which of the following symbols represents a phosphorus atom that has gained three electrons?
P+3
P
P+4
P-3
12
Which is correct based on Dalton's Atomic Theory?
Each atom is made up of tiny particles called ions
Each ion is made up of tiny particles called elements
Each element is made up of tiny particles called atoms
Each atom is made up of tiny particles called elements
13
Energy produced by the splitting of uranium atoms...
fossil fuel energy
nuclear energy
solar energy
geothermal energy
14
Who developed the "planetary" model of the atom?
Chadwick
Dalton
Bohr
Thomson
15
The Heisenberg Uncertainty Principle does NOT have to do with:
Momentum
Energy and speed
Position
Time
16
Atomic Theory is the theory of what?
the evolution of the universe
the evolution of science
our evolution of the idea of the atom
the evolution of species
17
What did possibly killed the dinosaurs?
Lead asteroid from Pluto
Iridium asteroid, detected by the isotope ratio
Uranium asteroid from asteroid belt
Radon from the Earth
18
The smallest subatomic particle is the ______.
neutron
electron
none of these; they are all the same size
proton
19
Electrons behave like harmonic oscilator. Erwin Shrodinger was able to calculate
The atomic number of an element
The number of electrons in an atom
The shapes of electronic orbits - probability shapes
The mass number of an element
20
James Chadwick made which of the following contributions to the atomic theory?
discovered protons
discovered electrons
discovered that atoms are neutral
discovered neutrons
21
All ordinary matter is made out of atoms. True or false?
False
True
22
What did Bohr discover about the atom?
Proton
Neutron
Nucleus
Electron Energy Levels
23
Even though the Shrodinger atom is more correct we often use Bohr's model because:
It is made be a Nobel-winning scientist
It is prettier
It is easier to work with
It is an equal alternative
24
Electrons are carriers of
magnetism
none of these
electricity, negative charge
fire
25
The number of electrons determines ____.
All of the above
positive ions formed by losing electrons
negative ions formed by gaining electrons
neutral atoms having the same number of protons and electrons
26
The number of protons in the atom is the ____.
mass number
nuclear force
isotope number
atomic number
27
Why were some of the alpha particles able to pass through the foil?
because neutrons are neutral
because they were positively charged
because atoms are mostly empty space
they were deflected by the nucleus
28
Atoms of the same element with different masses are called ____.
anions
ions
isotopes
multiples
29
JJ Thomson. The picture below depicts the cathode-ray tube experiment that led to the discovery of _____.
electrons
the nucleus
protons
neutrons
30
You know now all about...
Electrons
Chemistry
Atoms
Lavoisier
31
The number of neutrons in the atom defines if it is the
isotope - stable, unstable
identity of the atoms
neutral, cation or anion
atomic number
32
If atoms do not exist,
There will be no planets and people
There will be no ordinary matter
All of the above
The universe as we know it will stop existing
33
Dalton could not explain the existence of isotopes.
False
He tried
True
Maybe he could
34
Atomic number of Na is 11. How many neutrons are in sodium-23?
11
14
23
23-11=12
35
According to Rutherford, where in the atom are electrons located?
in the nucleus
in the empty space surrounding the atom
distributed evenly all throughout the atom
in circular orbits called electron shells
36
What is the Heisenberg Principle?
Pinging subjects throughout the day.
Can never know momentum and position of the electron at the same time
Breaking Bad
People want to appear happy to the rest of the world.
37
Which of the following isotopes represents an atom that has 17 protons and 20 neutrons?
17Cl
35Cl
37Cl
37Ca
38
How did Bohr modify Rutherford's model of the atom?
placed electrons in discrete energy levels
proposed the electrons are located in the nucleus
discovered the atomic nucleus
added neutrons to the nucleus
39
What is special about Bohr's model?
It shows the arrangement of all the electrons in shells
It portrays ionic bonds
It only shows the outer shell of an atom
It portrays covalent bonding
40
What contribution did Shrodinger and Heisenberg have to the atomic theory?
neutrons and protons will always be even in number.
Pluto is not a planet.
electrons do not exist
electrons - no 100% predictable path; orbits-shapes based on probability.
41
How many neutrons are in a zinc-65 atom?
30
65
35
40
42
Avogadro introduced the chemical package, the mole. What is the Avogadro constant for the # of atoms in one mole ?
6.03x10^23
6.23x10^20
6.20x10^23
6.022x1023
43
The next subatomic particle discovered. Proton, a
positive charge particle, fundamental constituent
something that is one and dose not come apart
distinguishes organisms from inorganic objects
an article of furniture consisting of a flat
44
All atoms from the periodic table have a _______ charge.
none of these
neutral
positive
negative
45
The number of protons in the atom defines the
identity of the atoms and their elements
mass number
neutral, cation or anion
atomic number
46
What 2 subatomic particle(s) are located in the nucleus?
protons only
protons and electrons
protons and neutrons
electrons and neutrons
47
Use the periodic table. How many electrons are in an O
-2
ion?
-2
6
8
10
48
Atoms are not uncuttable. Radioactive Isotopes...
All answers are correct
Have the change time equals a half life time
Are unstable
Spontaneously change into another isotope
49
What do atoms do?
Combine together to form molecules
Help you breath
Make up different motions
They are the building blocks of matter of the visible Universe
50
The law of conservation of mass was developed by _______.
Antoine Lavoisier
John Dalton
Niels Bohr
Joseph Proust
51
Why the atomic mass at the bottom is not a whole number?
Because is equal to the weighted average mass of all isotopes
Because it is expressed in significant figures
Because it is random
Because it is not rounded
52
A scientific theory is...
a well-tested explanation that unifies many observations
a proposed explanation for an observation
scientific principle that has no disproving data
the process of gathering information in a careful way
53
Neutrons have a ________ charge and are found _________.
positive, in the nucleus
neutral, in the empty space around the nucleus
negative, in the electron shells
neutral, in the nucleus
54
A proton in the center has?
no charge
a neutral charge
a negative charge
a positive charge
55
One of the primary goals of ancient alchemists was to _______.
transform a proton into a neutron
transform base metals into gold
develop the law of conservation of mass
discover what atoms were made of
56
The last subatomic particle discovered:
The neutron in the Nucleus
The cloud on the outside
The neutron on the outside
The electrons in the nucleus
57
Which of the following points from Dalton's atomic theory is
incorrect
?
Atoms can be joined, separated, or rearraged in chemical reactions.
All matter is composed of atoms.
Atoms cannot be created or destroyed.
All atoms of the same element have identical # of all particles.
58
The first person to suggest the idea of atoms was ________.
Dalton
an alchemist
Democritus, the laughing philosopher
Aristotle
59
Which of the following statements supports the law of definite proportions?
The mass of the reactants is always the same as the products
All matter is composed of atoms.
All atoms of the same element are identical.
Water, H2O is always 89% oxygen and 11% hydrogen.
60
How many electrons are in a Ca
+2
ion?
20
18
40
22
61
Same masses before and after a chemical reaction. The picture shown below represents which of the following concepts?
Law of definite proportions
Dalton's atomic theory
Law of multiple proportions
Law of conservation of mass
62
What is the first element on the periodic table?
Hydrogen
Helium
Lithium
Oxygen
63
What did Clair Patterson find out?
The Rb-Sr radiometric technique is better than U-Pb
Uranium leads to a fission chain reaction
The oldest rock crystals are Zircons from Australia
The atmosphere was contaminated with lead from the 20’s gasoline
64
Exposure to high concentration of radioactive isotopes can cause?
instant death
somatic damages and genetic mutations
3rd degree burns
nothing
65
Why were some alpha particles deflected in the Rutherford experiment?
Atoms are mostly empty space.
They could not pass through the atoms.
They were repelled by the positive nucleus.
The electrons caused the particles to bounce back.
66
Isotopes occur when there are a different number of
Protons
Nuclei
Electrons
Neutrons
67
A ______ contains the Avogadro number of particles.
solution
mole
molecule
ribosome
68
The Greek word "atomos" means _______.
very small
invisible
uncuttable
inexisting
69
Protons are 11. How many electrons are in a neutral sodium atom?
23
12
11
13
