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Chapter 3 Atomic Structure Flashcards | StudBud
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Chapter 3 Atomic Structure
Chapter 3 Atomic Structure
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The Atom and its structure
Flashcards
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1
Cathode rays are composed of
Protons
Positrons
Neutrons
Electrons
2
The atomic number of an element
the mass of the element.
the number of neutrons in each atom of that element.
1 mole of the element.
the number of protons in each atom of that element.
3
The line-emission spectrum of an element is caused by the energies released when electrons
absorbs energy
"jumps" from the ground to excited state.
"jumps" from a lower to higher energy level.
"jumps" from a higher to lower energy level.
4
Which color light in the visible spectrum has the longest wavelength?
red
blue
green
yellow
5
What is the AAM of Lithium if 7.42% is 6.02 amu
6
Li and 92.58% is 7.02 amu
7
Li?
5.95 amu
6.02 amu
6.95 amu
7.02 amu
6
Mass is neither created or destroyed in a chemical reaction. This scientific law is called
conservation of momentum
gravity
law of conservation
definite proportions
7
Which is one way Dalton's atomic theory has been shown to be incorrect?
Atoms of a particular element are identical.
Atoms can change identity in chemical reactions.
Atoms can be split into subatomic particles.
Atoms can be destroyed by chemical reactions.
8
John Dalton thought that atoms
are all composed of carbon
cannot be broken down further
contained molecules
have no mass
9
What is the frequency of light that has a wavelength of 3.1 x 10
-7
?
1.0 x 10-15 1/s
2.1 x 10-27 1/s
9.7 x 1014 1/s
93 1/s
10
Isotopes are atoms of the same element that have different numbers of
positrons
protons
electrons
neutrons
11
Experiments with cathode ray tubes proved that cathode rays are composed of
Negative particles
Magnetic particles
Neutral particles
Positive particles
12
The total volume of the nucleus of an atom is
is very large compared to the rest of the atom.
smaller than a neutron.
about the size of the electron.
is very small compared to the rest of the atom.
13
Most of the atom is
fluid
empty space
the nuclues
dense
14
Which of the following is not a part of Dalton's atomic theory?
Atoms combine in simple whole number ratios.
Atoms can't be subdivided, created or destroyed.
All matter is composed of atoms.
An atom consists of a nucleus and an electron cloud.
15
In Rutherford's gold foil experiment, he concluded that these particles were striking
a dense region of negative charge
a dense region of neutrons
a dense positive region
a tiny region with a strong magnetic feild
16
In the equation c=λf, the c represents
speed of light
speed of sound
wavelength
frequency
17
The isotope uranium-235 has 92 protons and 143 neutrons. What is the mass number?
51
143
235
92
18
Electrons can be found
inside the neutron.
moving rapidly around the nucleus.
inside the protons.
inside the nucleus.
19
The molar mass of an element is numerically equal to the element's
average number of protons
average atomic number
average number of electrons
average atomic mass
20
Find the energy of a photon with a wavelength of 8.95 x 10
-7
m?
5.05 x 1032 J
5.93 x 10-40 J
1.98 x 1020 1/s
2.22 x 10-19 J
21
To take a weighted average of all the naturally isotopes of a given element you would
add the mass and then divide by by the number of isotopes.
use the isotope with the smallest mass.
use the isotope with the largest mass.
multiply the mass by its % abundance, then add the products.
22
All nuclei are made of
protons and electrons
neutrons and electrons
protons and neutrons
protons and positrons
23
List the number of protons, electrons and neutrons in zinc-66.
30 p, 30 n, 66 e
66 p, 66 n, 30 e
30 p, 36 n, 30 e
30 p, 30 n, 30 e
