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15
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What does the electron cloud model describe?
The number of electrons in atoms
The mass of the electrons in an atom
The precise location of electrons in atoms
The most likely location of electrons in atoms
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thief
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thief
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banana
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fairy
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shark
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banana
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15
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Which statement tell's how Bohr's model of the atom differed from Rutherford's model?
Bohr's model focused on the electrons.
Bohr's model focused on the nucleus.
Bohr's model focused on the neutrons.
Bohr's model focused on the protons.
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15
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Democritus thought that matter was made of tiny particles
that could be divided.
of earth, air, fire, and water.
that could not be divided.
that were all round and smooth.
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15
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Which of these is always equal to the element's atomic number?
Number of electrons
Number of nuclei
Number of protons
Number of neutrons
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15
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Which statement is true about oxygen-17 and oxygen-18?
They do not have the same number of protons.
Their atoms have an identical mass.
They are isotopes of oxygen.
They have the same mass number.
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15
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How was Bohr's atomic model similar to Rutherford's model?
It describes electron position by using electron cloud model
It describes a nucleus surrounded by a large volume of space
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15
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In Bohr's model of the atom, electrons move
like popcorn in a popcorn popper.
like balls rolling down a hill.
like beach balls on water waves.
like planets orbiting the Sun.
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15
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Which statement about subatomic particles is NOT true?
Protons and electrons have opposite charges.
Protons and neutrons have almost the same mass.
Neutrons have no charge.
Protons and neutrons have the same charge.
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15
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J. J. Thomson's experiments provided evidence that an atom
has a negative charge.
contains negatively charged particles.
is the smallest particle of matter.
has a positive charge.
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15
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The number of protons in one atom of an element is that element's
balanced charge.
atomic number.
mass number.
isotope.
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15
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Which expression accurately compares the masses of neutrons and protons?
Mass of 1 neutron = mass of 1 electron
Mass of 2000 neutron = mass of 1 proton
Mass of 1 neutron = mass of 1 proton
Mass of 1 electron = mass of 1 proton
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15
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Which sentence states what Rutherford concluded from the gold foil experiment?
At atom's positive charge is concentrated in it's nucleus.
An atoms negative charge is concentrated in it's nucleus.
The atom's positive charge is spread evenly about the atom.
Thomson's model of the atom was correct.
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15
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Which is true when all of an atoms electrons are in orbitals with the lowest possible energies?
The atom is in its ground state.
The electrons are in an unstable configuration.
The atom is in an excited state.
The electrons are in the most stable configuration.
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