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15
×
Which of these is always equal to the element's atomic number?
Number of protons
Number of electrons
Number of neutrons
Number of nuclei
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seesaw
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shark
Other team loses 20 points!
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fairy
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5
10
15
20
25
×
lifesaver
Give 20 points!
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seesaw
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star
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fairy
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25
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lifesaver
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15
×
J. J. Thomson's experiments provided evidence that an atom
has a negative charge.
has a positive charge.
contains negatively charged particles.
is the smallest particle of matter.
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15
×
Which is true when all of an atoms electrons are in orbitals with the lowest possible energies?
The atom is in an excited state.
The atom is in its ground state.
The electrons are in the most stable configuration.
The electrons are in an unstable configuration.
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15
×
Who provided evidence for the existence of a nucleus in an atom?
John Dalton
Ernest Rutherford
J. J. Thomson
Democritus
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15
×
Which subatomic particle has a negative charge?
Electron
Alpha particle
Neutron
Proton
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15
×
Which statement about particles is TRUE?
Electrons have no mass.
Protons, neutrons, Â electrons all have about the same mass.
Neutrons have no charge and no mass.
An electron has far less mass than a proton or a neutron.
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eraser
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star
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fairy
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25
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baam
Lose 25 points!
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15
×
What do scientists use to predict the locations of electrons in atoms?
Algebra
Ratios and proportions
Probability
Geometry
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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 nucleus.
Bohr's model focused on the electrons.
Bohr's model focused on the protons.
Bohr's model focused on the neutrons.
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lifesaver
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star
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fairy
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25
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banana
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15
×
Democritus coined this word for a tiny piece of matter that cannot be divided
electron
molecule
element
atom
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15
×
What can you assume has happened if an electron moves to a higher energy level?
The electron has lost energy.
The atom has become more stable.
The atom has lost an electron.
The electron has gained energy.
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15
×
Which element has an atomic number of 15, same number of protons?
Al
Ne
P
S
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15
×
Which of the following is NOT part of Dalton's atomic theory?
All elements are composed of atoms.
All atoms of the same element have the same mass.
Atoms contain subatomic particles.
A compound contains atoms of more than one element.
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