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15
×
To find the number of neutrons in an atom, you would subtract
Isotope number from atomic number.
Atomic number from electron number.
Atomic number from mass number
Mass number from atomic number.
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15
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Which of these is always equal to the element's atomic number?
Number of nuclei
Number of electrons
Number of neutrons
Number of protons
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15
×
Which subatomic particle has a negative charge?
Alpha particle
Proton
Electron
Neutron
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15
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In Bohr's model of the atom, electrons move
like planets orbiting the Sun.
like popcorn in a popcorn popper.
like beach balls on water waves.
like balls rolling down a hill.
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15
×
Which expression accurately compares the masses of neutrons and protons?
Mass of 1 neutron = mass of 1 electron
Mass of 1 neutron = mass of 1 proton
Mass of 1 electron = mass of 1 proton
Mass of 2000 neutron = mass of 1 proton
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banana
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star
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fairy
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25
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lifesaver
Give 25 points!
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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.
Thomson's model of the atom was correct.
The atom's positive charge is spread evenly about the atom.
An atoms negative charge is concentrated in it's nucleus.
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seesaw
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seesaw
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shark
Other team loses 20 points!
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lifesaver
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15
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What does the electron cloud model describe?
The precise location of electrons in atoms
The mass of the electrons in an atom
The number of electrons in atoms
The most likely location of electrons in atoms
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trap
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rocket
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gift
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lifesaver
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15
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Who provided evidence for the existence of a nucleus in an atom?
J. J. Thomson
Democritus
Ernest Rutherford
John Dalton
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seesaw
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seesaw
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gift
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thief
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15
×
How was Bohr's atomic model similar to Rutherford's model?
It describes a nucleus surrounded by a large volume of space
It describes electron position by using electron cloud model
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15
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What do scientists use to predict the locations of electrons in atoms?
Algebra
Geometry
Ratios and proportions
Probability
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15
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The glowing of a neon light is caused by electrons emitting energy as they
collide with other electrons.
collide with the nucleus.
move from higher to lower energy levels.
move from lower to higher energy levels.
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15
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Which statement is true about oxygen-17 and oxygen-18?
They are isotopes of oxygen.
They have the same mass number.
They do not have the same number of protons.
Their atoms have an identical mass.
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