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20
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How many protons, neutrons, and electrons are in an atom with an atomic number of 12 and a mass number of 24?
12 protons, 12 neutrons, 12 electrons
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15
×
What is the significance of the group number on the periodic table?
It indicates the number of valence electrons in the elements of that group.
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15
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How do you calculate the number of neutrons in an atom?
Subtract the atomic number from the mass number.
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15
×
Which subatomic particle did J.J. Thomson discover?
Electron
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boom
Lose 50 points!
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fairy
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25
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fairy
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thief
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15
×
Who proposed the first atomic model with indivisible atoms?
John Dalton
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15
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In Rutherford's atomic model, where is most of the atom's mass located?
In the nucleus
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15
×
Define Isotope
Atoms of the same element with different numbers of neutrons.
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20
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What are the elements found in Group 17 (VII A) called?
Halogens (e.g., fluorine, chlorine)
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20
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What are metalloids?
Elements with properties that are intermediate between metals and non-metals (e.g., silicon, boron).
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15
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Which atomic model introduced the concept of electrons orbiting the nucleus in energy levels or shells?
Niels Bohr
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20
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How is the periodic table arranged?
In order of increasing atomic number.
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lifesaver
Give 15 points!
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shark
Other team loses 25 points!
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fairy
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thief
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15
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What is an ion?
An atom or molecule with an unequal number of protons and electrons, resulting in a charge.
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20
×
In the periodic table, which group contains the alkali metals?
Group 1 (I A)
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thief
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25
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rocket
Go to first place!
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fairy
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thief
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