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Atomic Theory
Atomic Theory
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atomic theory
Flashcards
42 cards
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Questions
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Answers
1
How many electrons are in a Ca
+2
ion?
20
22
18
40
2
Violet light has a wavelength of 4.10 x 10
-12
m. What is the frequency?
7.3 x 1019 Hz
7.3 Hz
6.2 Hz
6.2 x 1019 Hz
3
How many neutrons are in a zinc-65 atom?
30
40
65
35
4
Who developed the "planetary" model of the atom?
Thomson
Chadwick
Dalton
Bohr
5
All isotopes of an element have the same ____.
mass number
number of neutrons
number of protons
atomic mass
6
Whose model of the atom is shown below?
Dalton's
Chadwick's
Rutherford's
Thomson's
7
The mass number of an atom can be determined by ___.
adding protons and electrons
subtracting neutrons and protons
adding protons and neutrons
subtracting atomic number and protons
8
Which principal is this violating? 1s
2
2s
2
2p
6
3s
1
3p
3
Aufbau Principal
Pauli Exclusion Principal
There is no violation.
Hunds Rule
9
Average atomic mass for element X with 37.919 amu (5.07%), 39.017 (15.35%), 42.111 (79.58%).
41.42 amu
61.25 amu
39.40 amu
52.35 amu
10
Neutrons have a ________ charge and are found _________.
negative, in the electron shells
neutral, in the nucleus
positive, in the nucleus
neutral, in the empty space around the nucleus
11
Which of the following symbols represents a phosphorus atom that has gained three electrons?
P
P-3
P+4
P+3
12
The picture shown below represents which of the following concepts?
law of multiple proportions
law of conservation of mass
Law of definite proportions
Dalton's atomic theory
13
Whose model of the atom is shown below?
Thomson's
Rutherford's
Bohr's
Dalton's
14
Isotopes are atoms of the same element that have different numbers of ____.
electron shells
neutrons
electrons
protons
15
Atoms have a _______ charge.
neutral
positive
none of these
negative
16
What is the shortest wavelength on the em spectrum?
X-Rays
UV Rays
Gama Rays
Microwaves
17
How did Bohr modify Rutherford's model of the atom?
placed electrons in energy levels
added neutrons to the nucleus
discovered the atomic nucleus
proposed the electrons are located in the nucleus
18
Why were some particles deflected in the experiment shown here?
They could not pass through the atoms.
Atoms are mostly empty space.
They were repelled by the nucleus.
The electrons caused the particles to bounce back.
19
Which of the following points from Dalton's atomic theory is incorrect?
Atoms cannot be created or destroyed.
All atoms of the same element are identical.
Atoms can be joined, separated, or rearraged in reactions.
All matter is composed of atoms.
20
The smallest subatomic particle is the ______.
electron
proton
none of these; they are all the same size
neutron
21
Which of the following isotopes represents an atom that has 17 protons and 20 neutrons?
35Cl
37Ca
17Cl
37Cl
22
Who proposed the nuclear model of the atom?
Thomson
Dalton
Bohr
Rutherford
23
The first person to suggest the idea of atoms was ________.
Aristotle
Democritus
Dalton
an alchemist
24
According to Rutherford, where in the atom are electrons located?
distributed evenly all throughout the atom
in the nucleus
in the empty space surrounding the atom
in circular orbits called electron shells
25
Calculate the wavelength of radiation with a frequency of 8.0 x 10
14
Hz.
3.75 X 10-2 m
0.75 X 10-7 m
3.75 X 10-7 m
3.75 m
26
Why were some of the alpha particles in Rutherford's experiment able to pass through the foil?
because they were positively charged
because atoms contain a large amount of empty space
because neutrons are neutral
they were deflected by the nucleus
27
Which of the following is the proper noble gas configuration for Selenium?
[Kr] 4s23d104p4
[Kr] 4s23d104p4
[Ar] 3s23d104p4
[Ar] 4s23d104p4
28
How many electrons are in an O
-2
ion?
-2
10
6
8
29
The Greek word "atomos" means _______.
invisible
very small
uncuttable
indestructible
30
Which of the following was accomplished by Ernest Rutherford?
performed experiments with cathode ray tubes
proposed the first atomic theory
discovered that atoms contain large amounts of empty space
developed the plum pudding model of the atom
31
Atoms of the same element with different masses are called ____.
ions
multiples
anions
isotopes
32
What subatomic particle(s) are located in the nucleus?
protons only
electrons and neutrons
protons and neutrons
protons and electrons
33
The picture below depicts the cathode-ray tube experiment that led to the discovery of _____.
electrons
the nucleus
neutrons
protons
34
What is the atomic number of
207
Pb?
125
207
82
84
35
Which scientist thought atoms were simply solid spheres?
JJ Thomson
Ernest Rutherford
James Chadwick
John Dalton
36
James Chadwick made which of the following contributions to the atomic theory?
discovered protons
discovered electrons
discovered neutrons
discovered that atoms are neutral
37
The first atomic theory was proposed by ________.
Thomson
Lavoisier
Chadwick
Dalton
38
Electrons were discovered by _______.
James Chadwick
Ernest Rutherford
John Dalton
JJ Thomson
39
The number of protons in the atom is the ____.
nuclear force
isotope number
mass number
atomic number
40
What is the proper electron configuration for phosphorus?
1s22s22p63s23p2
1s22s22p63p5
1s22s22p63s23p3
1s22s22p63s2
41
Mass number can be calculated by ____.
adding protons and electrons
adding protons and neutrons
subtracting atomic number and protons
subtracting atomic number and neutrons
42
How many electrons are in a neutral sodium atom?
23
13
11
12
