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20
×
Who said that "electrons can only occupy certain orbits in the atomic shell"?
Niels Bohr
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15
×
Is C-14 a radioactive isotope?
True
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×
seesaw
Swap points!
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magnet
Take 5 points!
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fairy
Take points!
5
10
15
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25
×
thief
Give points!
5
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25
15
×
True or false: Isotopes can be stable and unstable.
True
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×
trap
No points!
Oops!
×
gold
Win 50 points!
Okay!
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shark
Other team loses 20 points!
Okay!
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thief
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5
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25
25
×
When an atom has less electrons that protons, it is called a __________?
cation
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20
×
Dalton believed that matter is made up of indivisible particles that cannot be _________
destroyed
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15
×
True or false: Are the atoms X (6 protons and 6 neutrons) and Y (7 protons and 5 neutrons) the same element?
False
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15
×
True or false: Atoms X (Z=20 A=40) and Y (Z=20 A=41) are isotopes.
True
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15
×
Did Dalton use the scientific method to study atoms?
Yes
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trap
No points!
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fairy
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5
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25
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gift
Win 10 points!
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×
thief
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25
×
Who said that "the positive charge of atoms in concentrated in a tiny central area"?
Rutherford
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10
×
Where was Democritus from?
Ancient Greece
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15
×
True or false: The electron configuration for silicon (Z=14) is 1s2 2s2 2p6 3s1 3p1
False
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25
×
Describe the planetary model.
describe
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15
×
The symbol for the mass number is ...
A
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